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Method for preparing boride of manganese at high temperature and high pressure

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 problems such as the difficulty of borides, and achieve the effect of easy implementation and simple method

Inactive Publication Date: 2011-12-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These factors not only make it very difficult to prepare a single-phase boride, but also easily introduce impurities other than Mn and B elements into the compound.

Method used

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  • Method for preparing boride of manganese at high temperature and high pressure
  • Method for preparing boride of manganese at high temperature and high pressure
  • Method for preparing boride of manganese at high temperature and high pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix analytically pure manganese powder (Mn) with a particle size of 1-5 microns and boron powder (B) with a particle size of 1-5 microns at a molar ratio of 1:2.5. Graphite is used as the heating tube in the assembly chamber, and pyrophyllite is used as the insulating tube. The synthetic pressure is 5.6GPa, the temperature is 1750K, and the pressure holding time is 20 minutes. After the heating is stopped, the sample is naturally cooled to room temperature and then the pressure is released. Under this condition, a pure phase is prepared. MnB 2 . For specific X-ray results, see figure 1 .

Embodiment 2

[0020] 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 5.6GPa, the temperature is 2000K, the holding time of pressure and heat preservation is 20 minutes, and the sample after stopping heating After naturally cooling to room temperature, the pressure is released. The manganese-boron compound prepared under this condition is mainly composed of Mn 3 B 4 phase, also contains a small amount of MnB phase. For specific X-ray results, see figure 2 .

Embodiment 3

[0022] The analytical pure manganese (Mn) powder with an average particle size of 200 nanometers is mixed with the boron (B) powder with an average particle size of 200 nanometers in a molar ratio of 1:4. After the powder is pressed and formed, it is assembled in the same way as in Example 1, and the synthesis pressure is 5.6GPa, temperature 1750K, holding pressure and holding time for 20 minutes. After stopping heating, the sample is naturally cooled to room temperature and then the pressure is released. The compound component prepared under this condition is mainly MnB 2 , with a small amount of MnB 4 Mutually. For specific X-ray results, see image 3 .

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Abstract

The invention discloses a method for preparing boride of manganese at high temperature and high pressure, belonging to the technical field of super hard materials. The boride of the manganese mainly comprises MnB2 or MnB4. The preparation method comprises the following steps: taking manganese powder and boron powder as raw materials; mixing the materials, briquetting, packaging, synthesizing at high temperature and high pressure, cooling and releasing to obtain the boride material of the manganese; wherein the molar ratio of the manganese powder to the boron powder is 1:2-4, and the high-temperature and high-pressure synthesis is to preserve heat and preserve pressure for 10-120min under the condition of the pressure of 1.0-6.0 GPa and the temperature of 1300-2000K. The method of the invention is simple, is easy to implement, does not adopt any fluxing agent, and adjusts the components of MnB2 material or Mn3B4 material and the purity thereof through the proportioning of the raw materials, the synthesized temperature and pressure, so as to prepare into MnB2 with higher purity.

Description

technical field [0001] The invention belongs to the technical field of superhard manganese borides, in particular to manganese diboride (MnB) as the main component. 2 ) or trimanganese tetraboride (Mn 3 B 4 ) of manganese boride 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. Searching for new, multifunctional superhard materials has always been a hot spot in materials science, physics, and engineering. Transition metal borides are potential superhar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/04
Inventor 孟祥旭朱品文何志刘冰冰崔田
Owner JILIN UNIV