High-temperature high-pressure preparation method of molybdenum boride

A high temperature and high pressure, high temperature and high pressure synthesis technology, applied in the direction of metal borides, boron/borides, etc., can solve the problem of high brittleness of transition metal borides, difficult to measure the hardness of samples, conductivity and other properties, and prepare single-phase borides. Difficulties and other problems, to achieve the effect of simple and easy-to-implement methods

Inactive Publication Date: 2012-07-04
JILIN UNIV
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Problems solved by technology

These factors not only make it very difficult to prepare single-phase borides, but also easily introduce impurities other than Mo and B elements into the compound. In addition, most transition metal borides are very brittle, and the prepared samples are difficult to form a whole block. Most of them are powder, which makes it difficult to measure the hardness, conductivity and other properties of the sample

Method used

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  • High-temperature high-pressure preparation method of molybdenum boride
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  • High-temperature high-pressure preparation method of molybdenum boride

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Embodiment 1

[0022] Mix analytically pure molybdenum powder (Mo) 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 2:1. In the assembly chamber, graphite is used as the heating tube, dolomite is used as the insulating tube, and pyrophyllite is used as the pressure transmission medium. The combined pressure is 4.8GPa, the temperature is 1800K, and the pressure holding time is 30 minutes. After the heating is stopped, the sample is naturally cooled to room temperature and then the pressure is released. , the main component prepared under this condition is Mo 2 B, there is still some Mo present. For specific X-ray results, see figure 1 .

Embodiment 2

[0024] Adopt the same raw material powder as in Example 1, mix according to the molar ratio of 1:1, adopt the assembly of Example 1 after the powder is pressed, the synthesis pressure is 4.8GPa, the temperature is 1800K, the holding time of pressure and heat preservation is 1 hour, and the sample after stopping heating After natural cooling to room temperature and pressure release, pure phase MoB was prepared under this condition. For specific X-ray results, see figure 2 .

Embodiment 3

[0026] Adopt the raw material powder identical with embodiment 1, mix by molar ratio 1: 2, after powder pressing molding, adopt the assembly identical with embodiment 1, synthesis pressure is 5.2GPa, temperature 2000K, hold pressure and heat preservation time 15 minutes, stop heating After the sample was naturally cooled to room temperature and then the pressure was released, the pure phase MoB was prepared under this condition 2 . For specific X-ray results, see image 3 .

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Abstract

The invention discloses a high-temperature high-pressure preparation method of molybdenum boride, belonging to the technical field of superhard material preparation. The method takes molybdenum powder and boron powder as raw materials and prepares the molybdenum boride material through the technological processes of mixing, briquetting, assembling, high-temperature high-pressure synthesis, cooling and pressure release, wherein in the high-temperature high-pressure synthesis, the temperature and pressure are maintained for 10-120 minutes under a pressure of 1.0-6.0GPa at a temperature of 1500-2100K; and the cooling and pressure release are performed finally to obtain the block sintered body of molybdenum boride. The method disclosed by the invention is simple and easy to implement, does not adopt any fluxing agent, and can synthesize single-phase Mo2B, MoB, MoB2 or Mo2B5 material through optimal raw material proportion, synthesis temperature, synthesis pressure and temperature / pressuremaintaining time.

Description

technical field [0001] The invention belongs to the technical field of preparation of superhard materials, in particular to molybdenum pentaboride (Mo 2 B 5 ), molybdenum diboride (MoB 2 ), molybdenum boride (MoB), dimolybdenum boride (Mo 2 B) The preparation method of boride high temperature and high pressure. Background technique [0002] Superhard materials (Vickers hardness greater than 40GPa) are used as materials for cutting, grinding, polishing and other processing tools due to their high pressure resistance, wear resistance, and stable chemical properties, and as anti-wear coatings on mechanical parts. Industry and other fields have important uses and are an important manifestation of a country's manufacturing level. Existing superhard materials are mainly concentrated in compounds formed from light elements such as B, C, N, O, etc., such as diamond, cubic boron nitride, BC 2 N.BC 5 Wait. There are certain limitations in the application of these materials. Se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/04
Inventor 朱品文陶强王欣黎军军何志崔田刘冰冰
Owner JILIN UNIV
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