Preparation method of titanium diboride composite material

A composite material, titanium diboride technology, applied in the field of materials, can solve the problems of weakening the application range of materials, coarse crystal grains of multiphase ceramics, low physical and mechanical performance indicators, etc., and achieves good application prospects, simple preparation methods, and material properties. superior effect

Inactive Publication Date: 2018-03-09
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  • Abstract
  • Description
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Problems solved by technology

[0002] TiB 2 It has the characteristics of high melting point, low density, high hardness, high fracture toughness, stable chemical properties, relatively inert, good oxidation resistance, but poor sinterability, brittleness in performance, and limited application
[0003] To increase TiB 2 The sintering properties of materials, researchers have chosen different sintering aids, recently in TiB 2 Various ceramic powders are introduced into the matrix to prepare various TiB 2 Composite ceramics; its series are mainly TiB 2 -SiC, TiC-TiB 2 , TiB 2 -NbC-SiC, etc.; using hot pressing or hot isostatic pressing after high temperature (2000°C) sintering, the grains of the composite ceramics are coarse (about 40 μm), which is easy to cause microscopic cracks, which greatly reduces the material properties , the physical and mechanical properties are not high, and the shape of the product is greatly restricted by hot pressing and hot isostatic pressing, which weakens the TiB 2 Application range of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] SiC powder, TiO 2 Powder, B 4 C powder, carbon powder and epoxy resin are mixed, the mixing ratio is SiC powder accounting for 25% by weight, and the rest is TiO 2 Powder, B 4 C powder, carbon powder and epoxy resin, by weight C element in carbon powder and epoxy resin: B 4 C powder: TiO 2 Powder=1:1.2:3;

[0019] Put the mixed material into a ball mill, add acetone as the ball milling medium for ball milling for at least 5 hours, dry the ball milled material, and prepare particles with a particle size of 24 to 80 mesh;

[0020] The particles are pressed into billets under the condition of 100 MPa, and the obtained billets are heated to 1350±20°C at a speed of 15~20°C / min under vacuum conditions, and kept for 1h; The temperature was raised to 1850±10°C at a certain speed, and the heat preservation and sintering was carried out for 2 hours to obtain a titanium diboride composite material.

Embodiment 2

[0022] SiC powder, TiO 2 Powder, B 4 C powder, carbon powder, TiB 2 Powder and epoxy resin are mixed, and the mixing ratio is 31% for SiC powder and 31% for TiB 2 Powder accounts for 8%, and the rest is TiO 2 Powder, B 4 C powder, carbon powder and epoxy resin, by weight C element in carbon powder and epoxy resin: B 4 C powder: TiO 2 Powder=1:1.3:4;

[0023] Put the mixed material into a ball mill, add acetone as the ball milling medium for ball milling for at least 5 hours, dry the ball milled material, and prepare particles with a particle size of 24 to 80 mesh;

[0024] The particles were pressed into billets under the condition of 150 MPa, and the obtained billets were heated to 1350±20°C at a speed of 15~20°C / min under vacuum conditions, and kept for 2 hours; The temperature was raised to 1850±10°C at a certain speed, and the heat preservation and sintering was carried out for 2.5 hours to obtain a titanium diboride composite material.

Embodiment 3

[0026] SiC powder, TiO 2 Powder, B 4 C powder, carbon powder, TiB 2 Powder and epoxy resin are mixed, and the mixing ratio is 37% for SiC powder and 37% for TiB 2 Powder accounts for 15%, and the rest is TiO 2 Powder, B 4 C powder, carbon powder and epoxy resin, by weight C element in carbon powder and epoxy resin: B 4 C powder: TiO 2 Powder=1:1.4:5;

[0027] Put the mixed material into a ball mill, add acetone as the ball milling medium for ball milling for at least 5 hours, dry the ball milled material, and prepare particles with a particle size of 24 to 80 mesh;

[0028] The particles were pressed into billets under the condition of 200 MPa, and the obtained billets were heated to 1350±20°C at a speed of 15~20°C / min under vacuum conditions, and kept for 3 hours; The temperature was raised to 1850±10°C at a certain speed, and the heat preservation and sintering was carried out for 3 hours to obtain a titanium diboride composite material.

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Abstract

A preparation method of a titanium diboride composite material is carried out according to the following steps: (1) SiC powder, TiO2 powder, B4C powder, carbon powder, TiB2 powder and resin binder are mixed; (2) put into a ball mill, Add an organic solvent as a ball milling medium for ball milling; (3) After pressing into a billet, heat it up to 1350±20°C under vacuum conditions, and heat it up to 1850±10°C under an inert atmosphere after heat preservation for sintering. The TiB2 introduced by the raw material in the titanium diboride dense composite material of the present invention reduces the problem that the raw material may not completely react to generate TiB2, the preparation method is simple, the obtained material has superior performance, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a titanium diboride composite material. Background technique [0002] TiB 2 It has the characteristics of high melting point, low density, high hardness, high fracture toughness, stable chemical properties, relatively inert, good oxidation resistance, but poor sinterability, brittleness in performance, and limited application. [0003] To increase TiB 2 The sintering properties of materials, researchers have chosen different sintering aids, recently in TiB 2 Various ceramic powders are introduced into the matrix to prepare various TiB 2 Composite ceramics; its series are mainly TiB 2 -SiC, TiC-TiB 2 , TiB 2 -NbC-SiC, etc.; using hot pressing or hot isostatic pressing after high temperature (2000°C) sintering, the grains of the composite ceramics are coarse (about 40 μm), which is easy to cause microscopic cracks, which greatly reduces t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/64
CPCC04B35/58071C04B35/64C04B2235/6562C04B2235/6567C04B2235/661
Inventor 迟述义
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