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High-hardness and high-thermal-stability tantalum nitride block prepared based on domestic cubic press

A technology of high thermal stability, six-sided top press, applied in the field of preparing large-sized tantalum nitride blocks based on domestic six-sided top press, can solve the problems of low hardness of WC-type tantalum nitride, and achieve a simple preparation process , Broaden the prospect of industrial application, the effect of low temperature and pressure conditions

Pending Publication Date: 2022-07-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the hardness of the WC-type tantalum nitride prepared by them is far lower than its theoretical hardness of 37.1 GPa

Method used

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  • High-hardness and high-thermal-stability tantalum nitride block prepared based on domestic cubic press
  • High-hardness and high-thermal-stability tantalum nitride block prepared based on domestic cubic press
  • High-hardness and high-thermal-stability tantalum nitride block prepared based on domestic cubic press

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Take tantalum nitride powder (CoSn-type tantalum nitride with hexagonal structure or WC-type tantalum nitride with cubic structure) for grinding. Vacuum treatment, take out the vacuum-treated tantalum nitride powder, use a mold to pre-press the tantalum nitride into a cylindrical block, put the pressed cylindrical block into the graphite in the pyrophyllite synthesis block, and the upper and lower ends of the graphite tube are in turn Assemble the graphite sheet, molybdenum sheet and conductive steel ring. After assembling, put the synthetic block into the synthesis chamber of the large press, at a temperature of about 1000 ° C and a pressure of about 2 GPa, after about 20 minutes of heat preservation and pressure, the synthetic sintered block was taken out after cooling and depressurization, and the block WC- type tantalum nitride.

Embodiment 2

[0019] Example 2: Take tantalum nitride powder (CoSn-type tantalum nitride with hexagonal structure or WC-type tantalum nitride with cubic structure) for grinding. Vacuum sintering, take out the tantalum nitride powder after vacuum sintering, use a mold to pre-press the tantalum nitride into a cylindrical block, put the pressed cylindrical block into the graphite in the pyrophyllite synthesis block, and the upper and lower ends of the graphite tube are in turn Assemble the graphite sheet, molybdenum sheet and conductive steel ring. After assembly, put the synthesis block into the synthesis chamber of the large press. At a temperature of about 1400 ° C and a pressure of about 4 GPa, after about 45 minutes of heat preservation and pressure, the sintered block is taken out after cooling and depressurization. The block is WC- type tantalum nitride.

Embodiment 3

[0020] Example 3: Take tantalum nitride powder (CoSn-type tantalum nitride with hexagonal structure or WC-type tantalum nitride with cubic structure) for grinding. Vacuum sintering, take out the tantalum nitride powder after vacuum sintering, use a mold to pre-press the tantalum nitride into a cylindrical block, put the pressed cylindrical block into the graphite in the pyrophyllite synthesis block, and the upper and lower ends of the graphite tube are in turn Assemble the graphite sheet, molybdenum sheet and conductive steel ring. After assembly, put the synthesis block into the synthesis chamber of the large press. At a temperature of about 1600 ° C and a pressure of about 5 GPa, after about 30 minutes of heat preservation and pressure, the sintered block is taken out after cooling and depressurization. The block is WC- type tantalum nitride.

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Abstract

The invention discloses a preparation method for preparing a large-size tantalum nitride block based on a domestic cubic press. The preparation process comprises the following steps: (1) grinding a tantalum nitride initial material; (2) carrying out vacuum treatment on the tantalum nitride powder obtained by grinding, and pre-pressing into a cylindrical block; (3) putting the pressed cylindrical block into a high-pressure synthesis block; (4) placing the high-pressure synthesis block in a synthesis cavity of a domestic cubic press for high-temperature and high-pressure phase change sintering; the sintering pressure is 2-6 GPa; the temperature is 600 to 1800 DEG C; the heat preservation time is 5-60 minutes; and (5) after sintering is completed, cooling and pressure relief are performed, and a tantalum nitride sintered body with the block diameter reaching 10 mm is taken out. The tantalum nitride block prepared by the method has the characteristics of uniform microstructure, few pores and better hardness and thermal stability than the traditional pure-phase tungsten carbide, and can be widely applied to the fields of mechanical manufacturing, geological drilling, grinding tool industry and the like.

Description

technical field [0001] The invention relates to a preparation method of a superhard block material, in particular to a large-size tantalum nitride block prepared by a domestic six-sided top press. Background technique [0002] Numerous studies have shown that tantalum nitride (TaN) has excellent heat resistance, chemical stability and hardness, making it useful in industrial production and other fields. In particular, theoretical studies have shown that tungsten carbide (WC-type) tantalum nitride is a superhard material with a theoretical hardness of up to 37.1 GPa, and it has a bulk elastic modulus (400 GPa) similar to that of cubic boron nitride (cBN). GPa). In 1972, Brauer et al. synthesized WC-type tantalum nitride for the first time at 1073-1233 K and 2-10 GPa temperature and pressure. Twenty years later, Mashimo et al. also successfully prepared a single-phase bulk of WC-type tantalum nitride at a static pressure of 0.8-3 GPa. However, the hardness of the WC-type ta...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622C04B35/645
CPCC04B35/58064C04B35/622C04B35/645C04B2235/6581C04B2235/96C04B2235/6582
Inventor 雷力冯雷豪
Owner SICHUAN UNIV
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