High-temperature high-pressure preparation method for titanium diboride

A titanium diboride, high temperature and high pressure technology, which is applied in the field of high temperature and high pressure preparation of titanium diboride, can solve problems such as the difficulty of TiB2 body materials, and achieve the effects of easy implementation, enhanced toughness, and simple methods

Inactive Publication Date: 2012-07-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the preparation of pure phas

Method used

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  • High-temperature high-pressure preparation method for titanium diboride
  • High-temperature high-pressure preparation method for titanium diboride
  • High-temperature high-pressure preparation method for titanium diboride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix analytically pure titanium powder (Ti) with a particle size of 1 to 5 microns and boron powder (B) with a particle size of 1 to 5 microns at a molar ratio of 1:8. Graphite is used as the heating tube in the assembly cavity, and pyrophyllite is used as the insulating tube. The synthetic pressure is 4.8GPa, the temperature is 1500K, and the pressure holding time is 1 hour. After the heating is stopped, the sample is naturally cooled to room temperature and the pressure is released. TiB 2 . For specific X-ray results, see figure 1 . When the molar ratio of boron powder and titanium powder is high, the synthesis temperature and holding time of holding pressure can be reduced.

Embodiment 2

[0024] Adopt the same raw material powder as in Example 1, mix according to molar ratio 1: 2.2, adopt the assembly of Example 1 after powder pressing molding, synthesis pressure is 4.8GPa, temperature 1600K, holding pressure and heat preservation time 2.5 hours, stop heating the sample Naturally cool to room temperature and release pressure, this condition produces pure phase TiB 2 . For specific X-ray results, see figure 2 .

Embodiment 3

[0026] Adopt the same raw material powder as in Example 1, mix according to the molar ratio of 1:2, adopt the assembly of Example 1 after the powder is pressed, the synthesis pressure is 4.8GPa, the temperature is 1600K, the holding time of pressure and heat preservation is 3 hours, and the sample after stopping heating Naturally cool to room temperature and release pressure, this condition produces pure phase TiB 2 . For specific X-ray results, see image 3 .

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Abstract

The invention relates to a high-temperature high-pressure preparation method for titanium diboride and belongs to the technical field of preparation for ultra-hard ceramic material. The method comprises the following steps of: taking titanium powder and boron powder as raw materials or titanium powder and carbon tetraborate powder as raw materials; preparing titanium diboride material by performing the processes of mixing materials, pressing into blocks, assembling, high-temperature high-pressure synthesis, cooling and releasing pressure; performing on a high-pressure device, after keeping temperature at 1300-2000K and pressure at 1.0-6.0GPa for 1-3 hours, cooling and releasing pressure, thereby obtaining TiB2 bulk sintered body. The method provided by the invention is simple and easily implemented; no fluxing agent is adopted; the pure-phase TiB2 material is prepared by changing the proportion of the raw materials and the compounding condition; a result of X-ray detection shows that the product is pure TiB2 phase and no other impure phase is introduced; and according to the TiB2 material prepared by taking B4C as the raw material, the residual C element is capable of enhancing the toughness of TiB2 or the C element is simply separated from TiB2.

Description

technical field [0001] The invention belongs to the technical field of preparation of superhard ceramic materials, and mainly relates to titanium diboride (TiB 2 ) high temperature and high pressure preparation method. Background technique [0002] With its high pressure resistance, wear resistance, and stable chemical properties, superhard materials are used as materials for cutting, grinding, polishing and other processing tools, as anti-wear coatings on mechanical parts, etc., and have important uses in military, industrial and other fields. It is an important reflection of the level of a country's manufacturing industry. The application of the existing superhard materials diamond and cubic boron nitride has certain limitations. Finding new and multifunctional superhard materials has always been a hot field in materials science, physics and engineering. Transition metal borides are potential superhard materials with excellent mechanical and electrical properties. Such ...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/645
Inventor 朱品文黎军军王欣陶强何志崔田刘冰冰
Owner JILIN UNIV
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