Abrasive is to combine a boehmite, aluminum hydroxide and magnesium nitrate combined with the product

Abrasives grown in an aqueous gel abrasive abrasive technology has been considered a big step forward. Ministry of Industry abrasive early in the 1980s began using sol-gel processing method to generate an abrasive. Mineral technology manager explained, The abrasive is to combine a boehmite, aluminum hydroxide and magnesium nitrate  polycrystalline diamond  product. Magnesium nitrate is used as a modifier. These gel generated on the liquid taken out, allowed the formation of massive precipitate. then it is crushed into a desired size. And finally into the furnace calcination. This has been improved, like the very dense ceramic corundum abrasive as new. The sol-gel method of the production of  synthetic diamond  corundum normal  abrasive grinding  compared to the advantages of a gel abrasive after calcination in the broken, thus eliminating the micro-cracks. Abrasive micro-cracks on the grinding pressure, causing premature wear of the main factors abrasive.

Diamond powder and the former Soviet Union rather refined round of diamond powder

Static synthetic diamond powder catalyst method best carbon discussion Zhu Jiayong , Liu Zhongxiao , Zhang Xiao Xu , Xu Yumin ( Jilin Institute of Metallurgy ) ( rock graphite mine ) Abstract discovered a Type 3R content of up to about 30%, the degree of graphitization up to 94 % natural specialty graphite and successfully implemented with static method to touch coal direct synthesis of natural graphite diamond powder .diamond graphite conversion rate as high as 47 percent, complete crystal rate 76.2% , and so on more than 98% plot type , shape and type Ⅳ United States and the former Soviet Union refined diamond powder of diamond powder quite rounded , this paper introduces the best kinds of synthetic diamond powder specialty  polycrystalline diamond  main characteristics of natural and synthetic diamond powder used in the test situation . Introduction In the static pressure  Diamond blade  of diamond production , despite a lot of work , developed a variety of special graphite, transform a variety of ingredients, the development of new catalysts , and  Synthetic diamond  synthesis process parameters and process , graphite a diamond the conversion rate has been low ( 10% to 20% ) , severely restricts the diamond yield improvement and cost reduction. For this problem, in recent years to seek the best carbon source to do some work, made ​​with natural specialty graphite as carbon catalyst method using hydrostatic successful direct synthesis of diamond powder .

Has a very low turn-on and field emission threshold field strength, a large field emission current density and higher emission stability

Nanotubes having a smaller radius of curvature, the larger the aspect ratio, high conductivity, excellent mechanical strength and chemical stability, etc., making it ideal for field emission cathode material. The earliest research on carbon nanotube field emission is De Heer WA reported in 1995 in Science magazine published, followed by a large number of studies have shown that it has a very low turn-on and field polycrystalline diamond field strength, and a big field emission current density, and higher emission stability. Prepared using carbon nanotube field emission electron source  abrasive wheels  type flat panel display prototypes. Then there are some of the research team successfully demonstrated based on synthetic diamond powder as electron sources such as X-ray tube practical vacuum microelectronic devices. These devices are the core of the production process of an efficient carbon nanotube field emission cathode production. About CNT field emission cathode production there are three main methods: chemical vapor deposition, and electrophoretic assembly of printed carbon nanotube paste.

Metallic material by nano-diamond Hot Dip treatment, the hardness and wear resistance in the end, what changes have occurred

Conventional chemical treatment methods such as carburizing , nitriding , carbonitriding , etc., using a carbon , nitrogen atoms penetration into the material , especially metal sub-surface , thus changing the surface hardness, wear resistance and other mechanical properties. Although such treatment methods with lower production costs , but there are some drawbacks , such as handling complex process,  polycrystalline diamond  high hardness and wear resistance is not improved after treatment material permeable layer shallow, generally only tens to hundreds of micrometers , and nitrided layer interfacial bonding force is small, easy to peel , etc. The diamond as the hardest material in nature , its hardness and wear resistance has been widely recognized, and nanodiamond osmosis treatment process easy and  synthetic diamond powder , equipment requirements are not very high, penetration depth can be more than 20mm, processed steel structure and performance have undergone great changes. metallic material by impregnation nanodiamond heat treatment, the hardness and wear resistance in the end , what changes have occurred is unclear . article two kinds of metal materials , respectively  grinding wheel  treatment, the comparative experiments , the main test by nano-diamond heat treated metal material impregnated with the hardness and wear resistance are improved than carburizing treatment and observation and analysis of its microstructure changes that have occurred . choose one of two experimental conditions and methods of experimental material .

Discharge parameters that affect the dressing efficiency, trimming precision grinding wheel dressing effect and the key factor in performance

Ultra-precision grinding wheel diamond powder is ultra-precision machining technology research focus . The use of diamond powder grinding wheel for engineering ceramics and other brittle materials for ultra- precision grinding , grinding and polishing  synthetic diamond  the need , not only to meet the machining accuracy and surface quality requirements , but also greatly improve productivity and reduce processing costs. Ultra- precision grinding wheel diamond powder one of the key technologies of diamond powder dresser . EDM trimming method is an cubic boron nitride metal bond diamond powder wheel approach. Diamond grinding wheel dressing spark experiments showed that: discharge parameters that affect the dressing efficiency , trimming precision grinding wheel sharpening effects and performance of one of the key factors , thus finishing with a spark pulse power is very important. A metal-bonded diamond powder  polycrystalline diamond  dressing spark pulse power requirements analysis , including wheel dressing shaping and sharpening two parts. Shaping its axis of rotation of the grinding wheel surface satisfy certain geometric relationships between , for flat grinding wheel grinding wheel is to ensure roundness and cylindricity . Dressing is to make the surface of the abrasive wheel protruding to form a sharp cutting edge and the chip space .

With the decoration industry continues to develop, on the shape and size of stone products have become increasingly demanding

With the decoration industry continues to develop, on the shape and size of stone products have become increasingly demanding. A large number of CNC and automated processing  polycrystalline diamond  stone processing industry, decorative stone processing technology is generally divided into:  abrasive grinding  - coarse - fine grinding - grinding. Among them, the fine grinding and fine grinding stone restricting processing efficiency and accuracy of the main factors that also affect the CNC machine tools in the stone  Diamond blade  the main reason for the popularity. Therefore, the study grinding process has very important significance. Introduce a lot of information about Granite Grinding Mechanism, little about the actual production of grinding process.

Abrasive wear resistance sheet specimens, other materials can also be used to determine the sample plate or sheet Abrasive wear resistance

Rolling wear test is the so-called wheel disc at a predetermined load in contact with the rotating condition, so that the sample be worn, and measured the amount of wear tests. This method is suitable for the determination of plastic plates, sheets and  cutting tools  wear resistance,  cubic boron nitride  can also be used to determine the plate or sheet specimens abrasive wear resistance. The rolling wear tester used by the rotating disc, grinding wheel, loading device, abrasive dust  Polycrystalline diamond , repair wheel drive and other components. Economy, productivity, pleasant degree and green management, etc.; greenness on the grinding process evaluation system and evaluation methods were studied, pointing out that the system's modules and evaluation standards and methods;

Tool wear in the form of tool wear of the tool in the normal cutting process

Tool wear in the form of tool wear is the cutting tool is in the normal process, due to physical or chemical action, the tool has the effect of wear. In the cutting process, the tool rake face and flank face with chip and workpiece, and generates  polycrystalline diamond , while in the contact  synthetic diamond powder  high temperature and pressure. Therefore, as for the cutting, before the flank wear will occur. Tool wear has the following three forms. The rake face of tool wear shape wear (crater wear) in the cutting of plastic material, if the cutting speed and cutting large thickness tends to grind the surface of the first crescent knife.

Gear is an important quality indicators

Conjugate tooth profile of the slip rate is the relative sliding of two arc tooth profile and the tooth profile over the limit of the ratio of arc length. Slip ratio is larger, more serious tooth wear, friction loss also, it is an important quality gear indicator. Sliding engagement means zero rate of pure rolling between the tooth surface, it would reduce the friction between the teeth and wear. Engagement means such slip rate constant under the conditions of a pressure of the tooth profile of polycrystalline diamond , good tooth. In this paper, a rack meshing tool for the media on the plane of zero slip sliding engagement drive and wait for the theoretical derivation. The proposed: parameters via a toothed rack cutter  abrasive grinding of a sliding catch rates of tooth profile, two drawn flat rigid sliding engagement zero does not exist in the conclusions of the tooth profile, three other proposed slip rate of the presence of tooth profile vehicles range. Discussion only symmetrical tooth rack tooth profile conjugate tooth profile, because only this tooth profile greater practical significance.

Computers in the heat treatment applied research in the field of increasingly active

The application of heat treatment has a long history, but in practice there are still not able to produce satisfactory results, mainly in two aspects: first, low productivity and high cost; second rejection rate, economic poor. As part of its internal heat treatment process occurs very complex physical and chemical changes, so long failed to identify effective solutions. Development and application of  polycrystalline diamond  to solve these problems provided the conditions. Computers in the heat treatment applied research in the field of increasingly active. Heat treatment applied to the field of computer technology has made ​​a lot of achievements, which greatly promoted the development of heat treatment technology.  synthetic diamond  technology is a key technology areas. Vacuum heat treatment expert system is a computer technology, artificial intelligence technology and  abrasive wheels  technology integration of the product, they will apply to vacuum heat treatment and vacuum heat treatment process optimization control of process parameters on the conventional vacuum heat treatment technology can achieve quantitative, intelligent oriented and precise control.

For two-stage PDC bit more comprehensive study has important significance

With the increase in deep and ultra-deep, φ311mm diameter hole section and a larger increase and improve the deep wells of large diameter section of ROP has become an urgent need to solve the main problem. Two-stage PDC bit drilled through a  polycrystalline diamond  release stress and  cubic boron nitride  free surface, effectively improve the ROP. In this paper, two-stage PDC bit more comprehensive study has important significance. ① In rock excavation and finite element theory and method, based on the established two-stage conventional PDC bits PDC bits and bottomhole finite element model. Proposed using three time steps simulated truthfully spud.

Abroad has been very importance of new cutting teeth, using different forms of cutting teeth, a variety of new products have been developed

PDC bits are geological drilling industry has been more widely used, but mainly for drilling soft to medium hard homogeneous formation, but also not suitable for drilling hard formations. Drilling workers at  cutting tools  in recent years gradually in different strata of PDC cutting teeth the best structure and the best fabric tooth design, PDC bit better for the geological drilling industries. PDC cutter PDC bit is the basic cutting units, on the merits of its structural performance PDC polycrystalline diamond  has a decisive influence. Has always attached great importance to domestic and foreign research new cutting teeth, the use of different forms of cutting teeth, has developed a variety of new products, more representative of a  Synthetic diamond , pre-chamfered edges to strengthen the tooth, a protective layer covering cutting teeth, teeth and other composite structures. In the application of certain conditions, these special cutting teeth morphology significantly improved performance.

Because rock composition, structure, mode of occurrence of different surface

Rock mechanics characteristics are the basis for geotechnical studies, because rock composition, structure, mode of occurrence of different surfaces, leading to differences in the mechanical properties of rock, for geotechnical engineering should be a combination of different environmental conditions and engineering requirements for rock physical characteristics, in order to determine the economic  polycrystalline diamond design and technical feasible engineering control measures to provide basic data. In this paper, Panzhihua Zhu mine Dongshan head deformation and failure of slope landslides example, through the structure of the surface shear slope rock mass, in situ shear, unloading and rheological rock mechanics test,abrasive wheels geological conditions, evaluated Dongshan head rock mechanical properties, recommended engineering control measures required to determine the physical and mechanical parameters and applied in practice, and achieved good results.

Transformation of old wells for oilfield undertaken a research work

Transformation of old wells for oilfield undertaken a research work. Reaming drill bit for the current existing problems, this paper refer to the relevant provisions of the manual drilling,  Synthetic diamond  the existing design methods and oilfield drill specific geological conditions, the proposed drilling reaming or drilling reaming after a under conditions suitable for the job slimhole adjustable PDC drill bits, drill bits and PDC adjustable hydraulic characteristics,  polycrystalline diamond  field, the form of distribution of the teeth mechanical properties of drill and many other areas were analyzed. Reducing PDC drill bits hydraulic structures related to work performance quality and length of life.

PDC impact resistance test methods are mainly heavy weights and pendulum impact shocks France France

During drilling , the drill hole wall and the friction generated between large , uneven bottom of the hole and the residual friction rock flour and other comprehensive factors make the PDC bit additional force by uncertainty , seriously affect the use effect of the use of PDC life. Determine the effect of using PDC PDC diamond layer involves not only the strength , PDC large extent the impact resistance of diamond and  ynthetic diamond  by bonding strength between the direct effects . In use , when the PDC diamond layer shedding occurs , the entire drill will be damaged . Therefore, in order to improve the bonding strength of PDC interface , designed with a variety of interfaces , plane connection PDC PDC  polycrystalline diamond methods of performance testing method and the heavy weights of the impact pendulum impact method , commonly used for the heavy weights of impact method . The business impact resistance test according to the production  Abrasive grinding , the quality of the heavy Tuo , distances to the impact . This paper mainly uses tilting heavy impact energy analyzer Tuo France PDC impact toughness test , explore and study the impact of different interface structure on PDC performance, and through analysis of polycrystalline diamond layer fracture macroscopic morphology investigate the impact of PDC failure mechanism .

New PDC coring bit circular contour abandon the traditional knife-wing design

Bit crown design Huaqing oil region to massive sandstone reservoir, ranging from thick mudstone  polycrystalline diamond , sand and wide distribution, thickness, drilling, and no gravel strata belonging to medium hardness, wear and tear with the other principles and other principles of combining cutting crown profile design, the new PDC  cubic boron nitride  contour abandon the traditional knife-wing design, with flat double-arc design, schematic cross section of drill bits PDC cutter contour selection based on  grinding wheel  being drilled lithological features, choose the 13mm diameter composite sheet as the main PDC cutting elements, select the taper of 30 ° of the new tines PDC PDC for the auxiliary.

Difficulty in retaining hole blocking, low pore

Currently, the situ leachable sandstone-type uranium deposits of uranium exploration in China has become the main type deposits. Our situ leachable sandstone-type polycrystalline diamond  exploration areas are mainly located in the north of the Mesozoic-Cenozoic basins, drilling, construction difficult, the production of the main problems are: (1) rock cores taken low; (2) Drilling Protection blocking difficulties into the hole low; (3) hole accidents; (4) drilling efficiency is low, construction costs are high; (5) eggs conglomerate drilling difficult. "Loose rock coring" and "gravel drilling" is a basin-situ leachable sandstone-type synthetic diamond of two important problems. Thesis topics from the Nuclear Industry Geological Bureau "fifteen" uranium geology research project "situ leachable  cubic boron nitride  uranium deposits loose rock coring technology research and its applications", introduces the author in recent years, "loose rock coring technique research "and" gravel coring technology research, "Some aspects of the research carried out and achieved some results.

Coring drill bit uneven distribution of the cutting surface of the teeth and flutes

Therefore, in the coring process, to ensure diamond cutting teeth rational flow of fluid around to adequately wash and cool the drill bit is very important. Coring drill bit uneven distribution of the cutting  polycrystalline diamond  tooth and the flute, the number of  cubic boron nitride g from a few to a dozen, the jet at the bottom of a very tight space constraints and irregular wall turbulence produces a very complex flow, a method of  synthetic diamond  analysis of this complex flow field distribution is almost impossible, and the flow field of the structure and properties of structural optimization was carried hydraulic drill, improving the basis for cleaning and cooling effect.

Using mathematical statistical method to analyze the PDC cutter force

Coring drill bit is drilling formations, a key tool for core, coring drill merits of the quality will directly affect the quality of coring, core harvest rates and operating costs. Domestic PDC coring drill technology status compared with foreign advanced level there is a big gap, in addition to cutting the material quality of the objective reasons, the lack of scientific design theory and method is a very  abrasive grinding . This article from the PDC cutter force test to start, using mathematical statistical method to analyze the PDC cutter force and lithology, caster angle, the cutting area and the arc length of the relationship, the establishment of PDC coring bit downhole force model; while the PDC coring bit profile  polycrystalline diamond , cloth tooth design methods, downhole flow field analysis methods were studied and discussed; on this basis, in order to force the formation of a  synthetic diamond  for the center to take anti-vortex PDC core bit design methods. Developed three new PDC coring bit in field trials and achieved good results, and its faster core drilling, core harvest rate of 95% or more, has been widely promoted, to obtain a better economic and social benefits.

Can be incorporated in a cage inside the atomic electron volatile

Since been found since the fullerene compounds has been rapid development. Currently, the synthesized fullerene carbon cage C atoms majority; However, for those less than fullerenes, due to its high bending geometry , it has a unique electronic properties,  polycrystalline diamond  and physicist attention. experiments confirmed that the cage can be mixed with volatile internal atomic electrons, atoms, or in a cage outside  abrasive wheels , atoms, so that pentagon rule does not meet the independence atypical fullerenes stabilized recently, such as the use of the latter method successfully prepared a new, C atomic ratio less atypical fullerenes, and their structures were  Polycrystalline diamond  biggest feature is adjacent pentagons with Four 8 Cl atoms adsorbed on the two adjacent vertices of the pentagon, and another two Cl atoms adsorbed on the two hexagons - pentagons - hexagon common vertex to form a cage-like structure stable. other hand, has been confirmed experimentally and theoretically, often used to stabilize the same halogen fullerenes.