Method for preparing TiN/TiB2 composite material

A composite material and mixed powder technology, applied in the field of composite material preparation, can solve the problems of high sintering temperature, high production cost, poor mechanical properties, etc., and achieve the effects of good mechanical properties, low price, and uniform distribution of two phases

Inactive Publication Date: 2011-06-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve the existing problem of preparing TiN / TiB 2 The method of composite materials has the problems of expensive raw materials, high sintering temperature, high production cost, poor density and poor mechanical properties, and a TiN / TiB 2 Preparation method of composite material

Method used

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  • Method for preparing TiN/TiB2 composite material
  • Method for preparing TiN/TiB2 composite material

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0009] Specific implementation mode 1: TiN / TiB in this implementation mode 2 The preparation method of composite material is realized according to the following steps: 1. Weigh Ti powder, B powder and BN powder according to molar ratio 1: 0~1.25: 0.25~0.667, then pack into polyvinyl chloride tank, then add dehydrated alcohol and ZrO 2 Balls and ball mills were wet mixed for 12-48 hours to obtain mixed powders; 2. The mixed powders were dried and passed through 40-120 mesh sieves, and put into graphite molds. Raise the temperature to 1200-1500°C at a heating rate of 1 minute, and keep it warm for 30-240 minutes, then raise the temperature to 1600-1900°C at a heating rate of 10-60°C / min, and then apply a pressure of 20-40MPa, and keep it warm for 30-240 minutes, that is Get TiN / TiB 2 Composite material; wherein the amount of absolute ethanol added in step 1 is 1 to 3 times the total mass of Ti powder, B powder and BN powder; the mass ratio of balls to materials in step 1 is 3 ...

specific Embodiment approach 2

[0010] Embodiment 2: This embodiment differs from Embodiment 1 in that in step 1, Ti powder, B powder and BN powder are weighed in a molar ratio of 1:0.14:0.62. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0011] Embodiment 3: This embodiment differs from Embodiment 1 in that in step 1, Ti powder, B powder and BN powder are weighed in a molar ratio of 1:0.65:0.45. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

A method for preparing a TiN / TiB2 composite material relates to a composite material preparing method and solves the problems of expensive raw materials, high sintering temperature, high production cost and disappointing density and mechanical property, which exist in present methods for preparing the TiN / TiB2 composite material. The method comprises the following steps: 1, Ti powder, B powder and BN powder are weighed, then added into a jar and added with water-free ethanol and ZrO2 balls, and mixed powder is obtained by ball milling and wet mixing; and 2, after being dried, the mixed powder is placed in a graphite jig and then undergoes hot pressing and sintering so as to obtain the TiN / TiB2 composite material. In the invention, the raw materials are cheap, the process is simple, the composite material is sintered to be densified at a low sintering temperature, the density can reach 98.8-99.3%, crystal grains of the raw materials are small, and the prepared TiN / TiB2 composite material has good mechanical property which is demonstrated by the fact that three-point bending degree Sigma b is greater than or equal to 700MPa and fracture toughness KIC is greater than or equal to 8.5MPa.m<1 / 2>.

Description

technical field [0001] The invention relates to a preparation method of a composite material. Background technique [0002] TiN has excellent corrosion resistance, wear resistance and electrical conductivity, and can be used as a wear-resistant material and electrode electrical contact material. However, due to the low self-diffusion rate and high saturated vapor pressure of TiN, it is difficult to sinter and compact bulk materials. TiB 2 Among the currently known hard materials, TiB 2 Ranked fourth in hardness, TiB 2 It has stable chemical properties, strong anti-corrosion ability and good electrical conductivity. TiB 2 It is a candidate material for cutting tools, wear-resistant parts and an excellent candidate material for electrodes. But since TiB 2 The low self-diffusion rate makes the bulk material difficult to sinter and compact. [0003] Currently, the preparation of TiN / TiB 2 Composite materials are often sintered by hot pressing, which requires direct use o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 欧阳家虎杨振林刘占国
Owner HARBIN INST OF TECH
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