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Titanium silicide carbon/titanium diboride-titanium carbide compound material and preparation method thereof

A technology of titanium diboride and titanium silicide carbon, which is applied in the field of ceramic matrix composite materials and its preparation, can solve the problems of limited application and poor mechanical properties of titanium silicide carbon, and achieves low cost, improved mechanical properties, and good electrical conductivity. Effect

Inactive Publication Date: 2012-03-21
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the mechanical properties of TiSiC itself are poor, which limits its application as a structural material.

Method used

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  • Titanium silicide carbon/titanium diboride-titanium carbide compound material and preparation method thereof
  • Titanium silicide carbon/titanium diboride-titanium carbide compound material and preparation method thereof
  • Titanium silicide carbon/titanium diboride-titanium carbide compound material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] Raw material powder by molar ratio n(Ti):n(Si):n(C):n(B 4 C)=3.59:1.09:2:0.17 Weigh titanium powder (-300 mesh), silicon powder (-300 mesh), graphite powder (average particle size 15 micron powder) and boron carbide powder (average particle size 5 micron powder) After dry mixing in a polyethylene tank for 20 hours, place it in a graphite mold coated with boron nitride for cold press molding, then hot press and sinter in an argon atmosphere, raise the temperature to 1490°C at a rate of 30°C / min, and keep it for 2 hours , pressure 22MPa. The density of the obtained block material reaches 99.5%, the three-point bending strength of the material tested on the universal testing machine is greater than 700MPa, and the fracture toughness of the material measured by the unilateral notched beam method is greater than 9MPa m 1 / 2 . Carry out XRD analysis to the obtained product, such as figure 1 The product shown consists of titanium silicide, titanium diboride and titanium carb...

Embodiment 2

[0023] Raw material powder by molar ratio n(Ti):n(Si):n(C):n(B 4 C)=3.98:1.14:2:0.28 Weigh titanium powder (-300 mesh), silicon powder (-300 mesh), graphite powder (average particle size 10 micron powder) and boron carbide powder (average particle size 10 micron powder) After dry mixing in a polyethylene tank for 24 hours, place it in a graphite mold coated with boron nitride for cold pressing to shape, then hot press and sinter in an argon atmosphere, raise the temperature to 1510°C at a rate of 25°C / min, and keep it warm for 2 hours , pressure 25MPa. The density of the obtained block material reaches 99.4%, the three-point bending strength of the material tested on the universal testing machine is greater than 680MPa, and the fracture toughness of the material measured by the unilateral notched beam method is greater than 9MPa m 1 / 2 .

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Abstract

The invention relates to a titanium silicide carbon / titanium diboride-titanium carbide compound material and a preparation method thereof. The compound material consists of plate / columnar titanium diboride, equiaxed titanium carbide particle reinforcing phase and a layered titanium silicide carbon substrate, wherein the titanium diboride and the titanium carbide respectively accounts for 10-15 percent of the total volume of the material. The raw materials of titanium powder, silicon powder, graphite powder and boron carbide powder are evenly mixed according to the molar proportioning of (3.60-3.98): (1.85-1.14): 2: (0.17-0.28) by the physical mechanical method, then arranged in a graphite grinding tool with a protective coating layer on the surface for cold press molding and introduced into a hot-press furnace with shielding gas atmosphere for sintering, wherein the heating rate is 10-50 DEG C / minute, the sintering temperature is 1480-1520 DEG C, the sintering time is 1.5-2 hours and the sintering pressure is 22-25MPa. The invention has simple process and excellent material performance.

Description

Technical field: [0001] The invention relates to a ceramic matrix composite material and a preparation method thereof, in particular to in-situ synthesis of a dense titanium silicide carbon / titanium diboride-titanium carbide composite block material and a preparation method thereof. Background technique: [0002] Titanium silicide carbon is a typical representative of ternary layered ceramic materials. It combines many advantages of metal and ceramics. It has low density, high modulus, thermal shock resistance, good electrical and thermal conductivity, machinability and excellent high temperature oxidation resistance. It has good self-lubricating properties and a lower friction coefficient than traditional solid lubricant graphite and molybdenum disulfide. It is a structure-function integrated material. It is used in electrode brush materials, high-temperature structural materials and self-lubricating materials. It has broad application prospects. [0003] However, TiSiC it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/515C04B35/622C04B35/645
Inventor 杨建顾巍丘泰
Owner NANJING UNIV OF TECH