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Abrasive diamond composite and method of making thereof

A composite material and diamond technology, applied in the field of abrasive composite materials, can solve problems such as diamond degradation

Inactive Publication Date: 2004-12-01
DIAMOND INNOVATIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, prior art liquid-infiltrated composites have limited utility because diamond undergoes significant degradation due to corrosion by the liquid penetrant

Method used

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  • Abrasive diamond composite and method of making thereof
  • Abrasive diamond composite and method of making thereof
  • Abrasive diamond composite and method of making thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 0.3 g of commercial uncoated high-grade saw diamond crystals were mixed with 6 g of technical grade acyl iron powder and placed in an alumina boat. The boat was then placed in a furnace and heated to 850°C for a period of 1 hour in a hydrogen atmosphere. After taking it out from the furnace and cooling it, pass it successively in aqua regia, that is, 1:1 HF / HNO 3 Neutralize 9:1 H 2 SO 4 / HNO 3 Boil in medium to recover diamond from a part of free sintering.

[0042] The recovered diamonds were then evaluated by optical microscopy to estimate the extent of chemical attack. The recovered uncoated diamonds are indicated in Figure 5 middle. As can be seen in the photographs, a significant degree of corrosion in the iron matrix was observed for the uncoated diamond.

[0043] By measuring the difference in the apparent hardness of the diamond tip in the matrix versus the hardness of the matrix itself, the relative bond and retention of the diamond to the matrix is ​​e...

Embodiment 2

[0046] Commercially available diamond crystals for premium saws were coated with tungsten carbide (WC). The thickness of the WC coating is about 1.3 μm. 0.3g of coated diamond was then mixed with 6g of technical grade carbonyl iron powder and placed in an aluminum boat. The boat was then placed in a furnace and heated to 850°C for a period of 1 hour in a hydrogen atmosphere. After taking it out from the furnace and cooling it, pass it successively in aqua regia, that is, 1:1 HF / HNO 3 Neutralize 9:1 H 2 SO 4 / HNO 3 Boil in medium to recover diamond from part of freely sintered parts.

[0047] The recovered diamonds were then evaluated by optical microscopy to estimate the extent of chemical attack. The recovered coated diamonds are indicated in Image 6 middle. with uncoated diamond ( Figure 5 ) compared to the appearance of the diamond without WC coating was observed to be eroded by the iron matrix, indicating that the presence of the WC coating on the diamond improv...

Embodiment 3

[0050] Commercially available diamond crystals for high-grade saws were coated with silicon carbide (SiC). The thickness of the SiC coating is about 5 μm. 0.3g of coated diamond was then mixed with 6g of technical grade carbonyl iron powder and placed in an aluminum boat. The boat was then placed in a furnace and heated to 850°C in a hydrogen atmosphere for a period of 1 hour. After taking it out from the furnace and cooling it, pass it successively in aqua regia, that is, 1:1 HF / HNO 3 Neutralize 9:1 H 2 SO 4 / HNO 3 Boil in medium to recover diamond from part of freely sintered parts.

[0051] The recovered diamonds were then evaluated by optical microscopy to estimate the extent of chemical attack. The recovered coated diamonds are indicated in Figure 7 middle. with uncoated diamond ( Figure 5 ) compared to the appearance of the diamond without SiC coating was observed to be eroded by the iron matrix, indicating that the presence of the SiC coating on the diamond i...

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Abstract

An abrasive diamond composite (60) formed form coated diamond particles (10) and a matrix material (22). The diamonds (12) have a protective coating (14) formed from a refractory material having a composition MCxNy, that prevents corrosive chemical attack of the diamonds by the matrix material (22). The abrasive diamond composite (60) may further include an infiltrant, such as a braze material (40). Alternatively, the abrasive diamond composite (60) may include a plurality of coated diamond particles (10) and a braze material (40) filling interstitial spaces between the coated diamond particles (10). Methods of making such abrasive diamond composites (60) are also disclosed.

Description

Background of the invention [0001] The present invention relates to an abrasive composite material. More particularly, the present invention relates to abrasive compositions comprising coated diamond particles and a matrix material and methods of making such abrasive composites. Still more particularly, the present invention relates to abrasive composites comprised of coated diamond particles and a matrix material, wherein the matrix material is infiltrated with a strengthening material. Even more particularly, the present invention relates to chemically resistant coated diamond grains for use in such abrasive composites. [0002] Traditional diamond saw blade segments are manufactured by first mixing diamond crystals with a metal powder, typically cobalt, and then hot pressing the mixture to obtain the desired form. Due to cost issues, there is considerable interest in replacing cobalt in the matrix by other metals. [0003] Good adhesion of the diamond to the matrix and r...

Claims

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Application Information

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IPC IPC(8): B24D3/06B24D3/00C09C1/44C09C1/68C09C3/06C09K3/14
CPCC09K3/1436B24D3/00
Inventor M·P·德埃弗林K·J·纳朗J·M·小麦克哈勒M·H·罗A·W·萨尔克S·W·韦布
Owner DIAMOND INNOVATIONS INC
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