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Method for manufacturing boron nitride toughened polycrystalline diamond

A diamond micropowder and compound technology, applied in the field of material science, can solve problems such as difficulty in evenly dispersing on the surface of diamond micropowder, high melting point, etc.

Inactive Publication Date: 2014-06-25
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high melting point of simple boron, no solvent can dissolve it, it is difficult to disperse it evenly on the surface of diamond powder

Method used

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  • Method for manufacturing boron nitride toughened polycrystalline diamond
  • Method for manufacturing boron nitride toughened polycrystalline diamond
  • Method for manufacturing boron nitride toughened polycrystalline diamond

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] According to the process described in the above-mentioned embodiment, the B 5 h 9 Dissolve in cyclohexane, add diamond powder, stir evenly, and evaporate the solvent. Carry out powder briquette assembly and isostatic pressing sintering according to the specific implementation method, and finally become the final product through grinding and polishing. The performance testing results are listed in Table 1.

[0031] The total ingredient ratio is:

[0032] B 5 h 9 : 3.0g, 3.5g, 4.0g, 5.0g

[0033] Cyclohexane: 60

[0034] Diamond powder: 100g

[0035] Diamond powder ratio: W14:W5=5:1

[0036] Note: Diameter of tungsten carbide alloy sheet: 15mm; amount of diamond micropowder for a single sheet: 1.2g

[0037] Table 1 Measurement results of wear ratio (1: Ax10000)

[0038]

[0039] Note: Use silica grinding wheels as wear parts.

example 2

[0041] According to the process described in the above-mentioned embodiment, the B 6 h 10 Soluble in benzene, add diamond powder, stir evenly, and evaporate the solvent. Carry out powder briquette assembly and isostatic pressing sintering according to the specific implementation method, and finally become the final product through grinding and polishing. The performance test results are listed in Table 2 and Table 3.

[0042] The total ingredient ratio is:

[0043] B 6 h 10 : 4.0g

[0044] Benzene: 60

[0045] Diamond powder: 100g

[0046] Diamond powder ratio: W14:W5=5:1

[0047] Note: Diameter of tungsten carbide alloy sheet: 16mm; amount of diamond micropowder for a single sheet: 1.2g

example 3

[0049] According to the process described in the above-mentioned embodiment, the B 9 h 15 Dissolve in ethanol and benzene mixed solvent (ethanol / benzene volume ratio = 1 / 1), add diamond powder, stir evenly, and evaporate the solvent. Carry out powder briquette assembly and isostatic pressing sintering according to the specific implementation method, and finally become the final product through grinding and polishing. The performance test results are listed in Table 2 and Table 3.

[0050] The total ingredient ratio is:

[0051] B 9 h 15 : 4.0g

[0052] Mixed solvent of ethanol and benzene: 60

[0053] Diamond powder: 100g

[0054] Diamond powder ratio: W14:W5=5:1

[0055] Note: Diameter of tungsten carbide alloy sheet: 16mm; amount of diamond micropowder for a single sheet: 1.2g

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Abstract

The invention discloses a method for manufacturing boron nitride toughened polycrystalline diamond. The method includes dissolving boron compounds (B<5>H<9> or B<6>H<10> or B<9>H<15> or B<10>H<14> or carbon decaborane) in solvents; adding a calculated amount of diamond micro-powder into the solvents, uniformly stirring the diamond micro-powder and removing the solvents; filling zirconium cups with the coated diamond micro-powder, compacting the diamond micro-powder in the zirconium cups, placing the diamond micro-powder and carbon tungsten alloy sheets into molybdenum cups, compacting the diamond micro-powder and the carbon tungsten alloy sheets in the molybdenum cups, and weighting the calculated amount of coated diamond micro-powder, filling the coated diamond micro-powder in the zirconium cups, paving, compacting, covering the coated diamond micro-powder with the carbon tungsten alloy sheets, placing all in the molybdenum cups, and secondarily compacting through a mold to form a pre-compaction block; filling the pre-compaction block, table salt tubes, insulating tubes, graphite tube heating elements, conductive tablets, end caps and the like into a powder compression block to form complete assembly; placing the assemblies in a six-surface diamond presser, and performing isostatic pressing sintering on the assemblies at the temperature of 1480-1550 DEG C under the pressure of 5-5.5GPa to obtain polycrystalline diamond composite sheets. Two types of micro-powder with two different grain sizes are mixed to form the diamond micro-powder, the grain size of the coarse powder is 8-14 micrometers, the grain size of the fine powder is 0.5-2.5 micrometers, and a proportion of the coarse powder to the fine powder is 3 / 1-5 / 1. The method has the advantage that the diamond crystalline composite sheets manufactured by the aid of the method are high in heat resistance and abrasion resistance.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a method for manufacturing high-toughness diamond polycrystals by using diamond micropowder to add trace amounts of boron elements through hexahedron synthesis technology. Background technique [0002] Synthetic diamond polycrystal is a diamond grain aggregate formed by sintering diamond powder and cobalt micropowder binder under high temperature and ultra-high pressure. It has extremely high heat resistance and high thermal stability. Widely used in the manufacture of geological exploration drill bits, oil well drilling bits, tunnel boring bits, coal mining bits, diamond processing and machining tools, etc. Due to its own superiority, composite sheets are developed and produced at home and abroad, and there are many varieties and specifications. GE Corporation of the United States is the first manufacturer to introduce composite sheets. Its main product is compax, an...

Claims

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Application Information

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IPC IPC(8): E21B10/46B01J3/06
Inventor 李坤周学琴施玉芬陆刚
Owner CHANGZHOU UNIV
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