Preparation method of multi-component nano-crystal metal boride

A metal boride, nanocrystalline technology, applied in the field of materials, to achieve the effect of simple crystal structure

Inactive Publication Date: 2018-06-15
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, no transition metal borides with more than two components have been efficiently synthesized

Method used

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  • Preparation method of multi-component nano-crystal metal boride
  • Preparation method of multi-component nano-crystal metal boride
  • Preparation method of multi-component nano-crystal metal boride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Prepare the powder according to the ratio of Ti: Zr: Ta: Hf: Nb: B = 0.2:0.2:0.2:0.2:0.2:2, mix the powder evenly in the glove box, put it in the WC ball mill tank, press the ball: the material is Add WC balls at a ratio of 3:1, seal the ball mill tank, and install it in a high-energy ball mill (SPEX D.Prep 8000M). Every ball mill for 2 hours, pause for 15 minutes as a cycle, a total of 12 cycles, after mechanical grinding for 24 hours, Take out the powder in the glove box, fully soak it in n-hexane, take it out, and dry it in a drying oven at 80°C for 24 hours; put 1.5g of the powder into the BN mold, and use a six-sided top hydraulic press to match the powder in the BN mold. The powder is subjected to high temperature and high pressure treatment, the pressure is 59MPa, and the actual pressure on the powder is 5GPa; the heating device is turned on 100s after the overpressure is over, and after the temperature rises to 1500°C, the heat preservation and pressure holding a...

Embodiment example 2

[0035] Prepare the powder according to the ratio of Ti: Zr: Ta: Hf: Nb: B = 0.2:0.2:0.2:0.2:0.2:2, mix the powder evenly in the glove box, put it in a hard steel ball mill tank, press the ball The ratio is 3:1, put bearing steel balls with a diameter of 6mm, and seal the ball mill tank in a high-energy ball mill (SPEX D.Prep 8000M). Every ball mill for 2 hours, pause for 15 minutes as a cycle, a total of 10 cycles , after mechanical grinding for 20 hours, take out the powder in the glove box, fully soak the powder in n-hexane, take it out, and dry it in a drying oven at 80°C for 24 hours; put 2g of the powder into a BN mold, and use a six-sided top hydraulic press. The powder installed in the BN mold is subjected to high temperature and high pressure treatment, the pressure is 59MPa, the actual pressure on the powder is 5GPa, the heating device is turned on 100s after the end of the overpressure, and after the temperature is raised to 1000°C, the heat preservation and pressure ...

Embodiment 3

[0040] Prepare the powder according to the ratio of Ti:Zr:Ta:Hf:Nb:B=0.2:0.2:0.2:0.2:0.2:2, mix the powder evenly in the glove box, put it in the WC ball mill tank, and the ball-to-material ratio is 3 :1 ratio, add WC balls, seal the ball mill tank, install it in a high-energy ball mill (SPEX D.Prep 8000M), every ball mill for 2 hours, pause for 15 minutes as a cycle, a total of 8 cycles, after mechanical grinding for 16 hours, in the glove box Take out the powder, put the powder in n-hexane and fully soak it, take it out, and dry it in a drying oven at 80°C for 24 hours; put 1.5g of the powder into the BN mold, and use a six-sided top hydraulic press to dry the powder in the BN mold. High-temperature and high-pressure treatment, the pressure is 59MPa, and the actual pressure on the powder is 5GPa; 100s after the end of overpressure, the heating device is turned on, and the power is increased to 836W, corresponding to the sintering temperature of 800°C, heat preservation and pr...

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Abstract

The invention relates to a preparation method of a multi-component nano-crystal metal boride. The preparation method mainly comprises the following steps: grinding mixed powder of Ti, Zr, Ta, Hf, Nb and B2 elements in a ball milling tank, soaking the powder with n-hexane, and then carrying out drying, putting the dried mixture into a BN mould, carrying out high-temperature high-pressure treatmentby using a six-face top hydraulic press, then turning on a heating device to increase the temperature to 800-1500 DEG C, preserving the pressure and preserving the heat for 0.5 hour, carrying out water cooling on the obtained block to form a block material, putting the block material into a graphite mould, applying 40MPa pressure on an SPS device, carrying out heating to 1500-1700 DEG C under theprotection of an Ar atmosphere, then carrying out cooling with the furnace to 50 DEG C or below, releasing the pressure, introducing air, releasing the vacuum, carrying out polishing to remove a surface layer, and carrying out burnishing, so as to obtain the multi-component nano-crystal metal boride. According to the invention, the sintered block with high hardness and high toughness is obtained at a relatively low sintering temperature, the Vickers hardness reaches 28GPa, the fracture toughness reaches 11.2MPa*m1 / 2, the phase composition of the sintered body is single-phase TMB2, and the crystal structure is simple.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a method for preparing metal borides. Background technique [0002] In the mid-1950s, General Electric Company of the United States successfully synthesized the world's first artificial diamond and cubic boron nitride (c-BN), which promoted the large-scale industrial application of superhard materials. Superhard materials refer to materials with a Vickers hardness greater than 40GPa, which have high hardness, high strength, and excellent wear-resistant properties. Therefore, they are widely used in chip processing tools, wear-resistant coatings, abrasive materials, etc., in industrial production and aerospace play an irreplaceable role. With the development of industry, human beings have higher and higher performance requirements for superhard materials, and the existing superhard materials are becoming more and more difficult to meet human needs. Therefore, it is very import...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622C04B35/626C04B35/645C04B35/65
CPCC04B35/58064C04B35/622C04B35/62615C04B35/645C04B35/65C04B2235/404C04B2235/662C04B2235/781C04B2235/96
Inventor 沈同德赵燕燕辛圣炜张咪孙宝茹
Owner YANSHAN UNIV
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