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B4C-based ceramic material with TiH2 as sintering aid and preparation method of B4C-based ceramic material

A technology of ceramic materials and sintering aids, which is applied in the field of B4C-based ceramic materials and its preparation, can solve the problems of increased density of multiphase ceramics, oxidative environment hindering densification, and decreased hardness, etc., to achieve increased density, high hardness, The effect of small density

Active Publication Date: 2014-08-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a TiH 2 B for sintering aid 4 C-based ceramic materials, while providing its preparation method to solve the problem of using Ti powder as a sintering aid to prepare B 4 C is easy to produce the problem that the oxidizing environment hinders the densification, and at the same time solves the problem of using a large amount of TiH 2 with B 4 The density of multiphase ceramics prepared by C reaction sintering is greatly increased, and the hardness is greatly reduced, so as to meet the requirements of preparing light-weight and high-strength protective materials.

Method used

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  • B4C-based ceramic material with TiH2 as sintering aid and preparation method of B4C-based ceramic material
  • B4C-based ceramic material with TiH2 as sintering aid and preparation method of B4C-based ceramic material
  • B4C-based ceramic material with TiH2 as sintering aid and preparation method of B4C-based ceramic material

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment one, including mixing step and sintering step:

[0026] (1) mixing step: by mass percentage: B 4 C powder 90%, TiH 2 Powder 10%, B 4 C powder and TiH 2 The powder was placed in a ball mill, and then ball milled and mixed for 6 hours with absolute ethanol and agate balls as the medium; it was rotated and evaporated under vacuum, then dried in a vacuum oven at 50°C for 24 hours, and sieved with a 400-mesh sieve to prepare get mixed powder;

[0027] The B 4 C powder has an average particle size of 2 to 5 microns and a purity greater than 99%; the TiH 2 The particle size of the powder is less than 325 mesh, and the purity is greater than 99%;

[0028] (2) Sintering step: put the mixed powder into a graphite mold according to the required ceramic material thickness of 5 mm, then put the graphite mold into a hot-press sintering furnace, and heat-press and sinter in an atmosphere where argon is a protective gas , the sintering temperature is 1700°C, the heati...

Embodiment 2

[0030] Embodiment two, including mixing step and sintering step:

[0031] (1) mixing step: by mass percentage: B 4 C powder 99%, TiH 2 Powder 1%, B 4 C powder and TiH 2 The powder was placed in a ball mill, and then mixed with anhydrous ethanol and agate balls for 24 hours; it was rotated and evaporated under vacuum, then dried in a vacuum oven at 80°C for 26 hours, and sieved with a 100-mesh sieve to prepare get mixed powder;

[0032] The B 4 C powder has an average particle size of 2 to 5 microns and a purity greater than 99%; the TiH 2 The particle size of the powder is less than 325 mesh, and the purity is greater than 99%;

[0033] (2) Sintering step: put the mixed powder into a graphite mold according to the required ceramic material thickness of 10 mm, then put the graphite mold into a hot-pressing sintering furnace, and heat-press and sinter in a vacuum at a sintering temperature of 2000 ° C. The speed is 50°C / min, the hot pressing pressure is 60MPa, the tempera...

Embodiment 3

[0035] Embodiment three, including mixing step and sintering step:

[0036] (1) mixing step: by mass percentage: B 4 C powder 90%, TiH 2 Powder 10%, B 4 C powder and TiH 2 The powder was placed in a ball mill, and then mixed with anhydrous ethanol and agate balls for 6 hours; it was rotated and evaporated under vacuum, then dried in a vacuum oven at 50°C for 28 hours, and sieved with a 400-mesh sieve to prepare get mixed powder;

[0037] The B 4 C powder has an average particle size of 2 to 5 microns and a purity greater than 99%; the TiH 2 Powder, particle size less than 325 mesh, purity greater than 99%;

[0038] (2) Sintering step: according to the required ceramic material thickness of 20 mm, put the mixed powder into a graphite mold, then put the graphite mold into a discharge plasma sintering furnace, and discharge in an atmosphere where argon is a protective gas Plasma sintering, the sintering temperature is 1600°C, the heating rate is 50°C / min, the sintering pre...

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Abstract

The invention discloses a B4C-based ceramic material with TiH2 as a sintering aid and a preparation method of the B4C-based ceramic material, belonging to a preparation method of a ceramic material and being used for solving the problem that the densification is inhibited by an oxidation environment easily generated when B4C is prepared by taking Ti powder as the sintering aid and also solving the problems of great density increase and great hardness reduction of composite ceramics prepared by reacting between large addition amounts of TiH2 and B4C and sintering so as to meet the requirement for preparing light-weight high-strength materials. The B4C-based ceramic material disclosed by the invention is prepared by sintering after mixing B4C powder and TiH2 powder, wherein the components are weighted according to the mass percentage: 90-99% of B4C powder and 1-10% of TiH2 powder. The preparation method disclosed by the invention comprises the steps of mixing and sintering. The ceramic material prepared by the invention is high in hardness, low in density and electrical resistivity, high in bending strength and fracture toughness, and capable of well meeting the requirements for various technical indexes of a protective material, improving the protection reliability and realizing electrical discharge machining, and has the potential of mass production.

Description

technical field [0001] The invention belongs to a method for preparing ceramic materials, in particular to a TiH 2 B for sintering aid 4 C-based ceramic material and preparation method thereof. Background technique [0002] In light armor devices, high-hardness ceramic materials are generally used as hard panels, B 4 C is the smallest density among ceramic materials, even lower than aluminum, only 2.52g / cm 3 . Its hardness is second only to diamond and cubic boron nitride (CBN) in nature, especially the nearly constant high-temperature hardness (>30GPa) is far more than diamond and CBN, while B 4 C also has the characteristics of high melting point (2450°C), high modulus, good wear resistance and strong acid and alkali resistance, and has good neutron and oxygen absorption capacity, thermoelectric properties (140S / m, room temperature) and low Expansion coefficient (5.0×10 -6 ·K -1 ). Therefore, Wang Zhengjun in "B 4 C Preparation method and application of protect...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/622
Inventor 傅正义季伟王为民张金咏张帆王皓王玉成张清杰
Owner WUHAN UNIV OF TECH
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