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Polycrystalline abrasive grit

An abrasive, polycrystalline superhard technology, applied in the direction of abrasives, abrasive jet machine tools, grinding devices, etc., can solve problems such as low yield and quality, high energy consumption, and restrictions on the control of the final product shape and size

Inactive Publication Date: 2006-04-05
六号元素(控股)公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] High pressure / high temperature sintering followed by pulverization is not ideal because of the high energy consumption in pulverized sintered PCD and limited control over the shape and size of the final product
Therefore, yield and quality are often low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A solvent-based suspension was prepared containing 80 wt% diamond (average particle size approximately 10 microns) and 20 wt% submicron cobalt powder with approximately 1 vol% organic binder added. The suspension was processed using a combination of spray drying and fluidized bed techniques to produce eco-spherical particles with a diameter of approximately 1 mm and a porosity of approximately 42%. Solvent-based suspensions were prepared using submicron molybdenum powder. Fluidize the diamond / cobalt particles and spray dry the particles with a molybdenum suspension with a thin layer of molybdenum approximately 100 microns thick.

[0039]The coated eco-granules were placed into a mold and compacted uniaxially to form a compact with a density of approximately 60%. The binder was removed from the eco-pellets by heat treatment at 1100 °C for 2 h in vacuum. The degassed eco pellets are then packed into metal containers. The metal container was loaded into the reaction box...

Embodiment 2

[0041] An organic suspension of hexagonal boron nitride containing a small amount of dissolved organic binder was prepared. The molybdenum-coated eco-particles described in Example 1 were fluidized and the hexagonal boron nitride suspension was used to spray apply a second coating of hexagonal boron nitride to a thickness of approximately 100 microns. The same compaction, degassing and high temperature / high pressure treatment described in Example 1 was repeated to recover the bonded sintered compact from the metal container. Place the briquette in an ultrasonic bath filled with water. After several minutes of sonication, the briquette separated into many slightly round particles, approximately 0.6-0.8 mm in diameter. Careful analysis revealed that the particles consisted of sintered polycrystalline diamond abrasive coated with a thin layer of sintered molybdenum metal.

Embodiment 3

[0043] The method of Example 2 was repeated replacing the layer of hexagonal boron nitride with a layer of spray-deposited sodium chloride. The temperature for binder removal was lowered to 500°C (under argon) to prevent chloride volatilization. The same compaction, degassing and high temperature / high pressure treatment described in Example 1 was repeated to recover the bonded sintered compact from the metal container. Place the briquette in an ultrasonic bath filled with water. After several minutes of sonication, the briquette separated into many slightly round particles, approximately 0.6-0.8 mm in diameter. Careful analysis revealed that the particles consisted of sintered polycrystalline diamond abrasive coated with a thin layer of sintered molybdenum metal.

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PUM

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Abstract

A method is provided for producing a plurality of polycrystalline ultra-hard abrasive grit. The method includes the steps of providing a mass of ultra-hard abrasive particles or a mass of a combination of a precursor for such particles and a suitable solvent / catalyst, forming the mass into a plurality of green state granules, placing the granules with a separating medium between adjacent granules in the reaction zone of a high pressure / high temperature apparatus, subjecting the contents of the reaction zone to elevated temperature and pressure conditions which the ultra-hard abrasive particle is crystallographically stable, recovering the thus sintered material from the reaction zone and removing the separating medium in the sintered material to produce a plurality of crystalline abrasive grit. The ultra-hard abrasive is generally diamond or cubic boron nitride.

Description

Background of the invention [0001] The present invention relates to polycrystalline abrasives. [0002] Superhard abrasive bodies in the form of abrasive compacts or individual crystals are well known in the art. The abrasive compact is usually a diamond compact, also known as polycrystalline diamond or PCD, or a cubic boron nitride compact, also known as polycrystalline cubic boron nitride or PCBN. These abrasive compacts have been widely used in cutting, drilling, drilling, milling and other abrasive applications. [0003] This superhard abrasive body is produced under the conditions of high temperature and high pressure where the crystallography of the superhard abrasive is stable. Polycrystalline diamond or polycrystalline boron nitride can be produced with or without a second phase or binder matrix. When a second phase is provided, it may be a solvent / catalyst such as cobalt in the case of diamond, or may be a carbide forming element such as silicon. A similar sinteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/14B24D3/00B24D3/02B24D3/06B24C3/08B24D3/10B22F1/02B22F9/02B24DB24D3/08B24D18/00C09KC22C26/00
CPCB24D99/005B24D3/08C09K3/14C09K3/1409C09K3/1418C23F1/02C23F1/28
Inventor R·弗雷斯M·纳贝朗I·希格拉斯
Owner 六号元素(控股)公司