Method for obtaining compact titanium diboride material by using in-situ reaction between sintering aids

A sintering aid, titanium diboride technology, which is applied in the field of structural ceramics, can solve the problems of unfavorable and impacted high temperature mechanical properties and corrosion resistance of ceramics, and achieve the effects of easy control of process conditions, simple process and excellent mechanical properties.

Inactive Publication Date: 2015-03-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the residual low-melting point phase at the grain boundary of the material will adversely affect the high-temperature mechanical properties and corrosion resistance of ceramics.

Method used

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  • Method for obtaining compact titanium diboride material by using in-situ reaction between sintering aids
  • Method for obtaining compact titanium diboride material by using in-situ reaction between sintering aids
  • Method for obtaining compact titanium diboride material by using in-situ reaction between sintering aids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 7.5 grams of hexagonal boron nitride powder with a particle size of 10 microns, 8.2 grams of aluminum powder with a particle size of 400 mesh and 34.3 grams of titanium powder with a particle size of 200 mesh were ball-milled in a ball mill for 8 hours, dried and sieved, and more than 1.5 grams of the The mixed powder was mixed with 28.5 grams of 800 mesh titanium diboride powder and ball milled in a ball mill jar for 8 hours, dried and sieved. Then put it into a graphite mould, and cold-press to form it. The applied pressure is 20 MPa. After cold-pressing for 10 minutes, put it into a hot-press furnace for hot-press sintering. The heating rate is 20°C / min, heated to 1550°C and kept for 2 hours, and the pressure is gradually increased to 40MPa while the temperature is rising. The whole sintering process is carried out under the protection of argon. The material in this embodiment is mainly composed of titanium diboride, a small amount of titanium nitride and aluminum o...

Embodiment 2

[0033] 6 grams of hexagonal boron nitride powder with a particle size of 5 microns, 7 grams of aluminum powder with a particle size of 300 mesh, and 38 grams of titanium powder with a particle size of 300 mesh were ball-milled in a ball mill for 16 hours, dried and sieved, and more than 10 grams of all The mixed powder is mixed with 40 grams of 5000 mesh titanium diboride powder, ball milled in a ball mill jar for 16 hours, dried and sieved. Then put it into a graphite mould, and cold-press to form it. The applied pressure is 10 MPa. After cold-pressing for 25 minutes, put it into a hot-press furnace for hot-press sintering. The heating rate is 10°C / min, heated to 1500°C and kept for 1 hour, and the pressure is gradually increased to 20MPa while the temperature is rising. The whole sintering process is carried out under the protection of argon. The material in this embodiment is mainly composed of titanium diboride, titanium nitride and a small amount of aluminum titanium nit...

Embodiment 3

[0036]8.5 grams of hexagonal boron nitride powder with a particle size of 0.5 microns, 6.5 grams of aluminum powder with a particle size of 200 mesh and 30 grams of titanium powder with a particle size of 400 mesh were ball milled in a ball mill for 24 hours, dried and sieved, and more than 9 grams of the The mixed powder is mixed with 21 grams of 3000 mesh titanium diboride powder, ball milled in a ball mill jar for 24 hours, dried and sieved. Then put it into a graphite mould, and form it by cold pressing, the applied pressure is 10MPa, after cold pressing for 30 minutes, put it into a discharge plasma sintering furnace for sintering. The heating rate is 100°C / min, heated to 1250°C and kept for 10 minutes, and the pressure is gradually increased to 30MPa while the temperature is rising. The whole sintering process is carried out under the protection of argon. The material in this embodiment is mainly composed of titanium diboride and a small amount of titanium nitride and a...

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Abstract

The invention belongs to the field of structural ceramics, and particularly discloses a method for obtaining a compact titanium diboride material by using in-situ reaction between sintering aids. Mixed powder of Ti, Al and BN capable of reacting at a low temperature is utilized as a sintering aid; TiB2 ceramic of which the relative density is more than 98% is obtained at a low temperature (1250-1550 DEG C); meanwhile, the material also has the characteristics of high strength, high hardness, high elasticity modulus and the like. In addition, the final products of in-situ reaction between the sintering aids such as Ti, Al, BN and the like and amorphous oxide reaction of the TiB2 surface are TiB2, TiN, Ti2A1N, Al5O6N and the like. Except for the TiB2, the TiN, the Ti2A1N, the Al5O6N and the like also have high melting points and chemical stability, so that the TiB2 ceramic becomes a latent high-temperature structure material.

Description

technical field [0001] The invention belongs to the field of structural ceramics, in particular to a method for densifying a titanium diboride material by in-situ reaction between sintering aids. Background technique [0002] TiB 2 Ceramics have many advantages such as high melting point, high modulus, high hardness, excellent wear resistance, good thermal and electrical conductivity, and good chemical stability. It can be used in high temperature structural materials, cutting tools, wear-resistant parts, conductive coatings, etc. [0003] Currently TiB 2 The application of ceramics is still greatly restricted, the main reason is that it is difficult to obtain dense TiB 2 bulk material. Generally TiB 2 A dense sintered body can only be obtained at high temperature (>2000°C) and high pressure (>30MPa), and such a high sintering temperature will promote the excessive growth of grains, and even induce microcracks in the material, which greatly reduces the mechanical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/58
Inventor 陈继新赵国瑞王晓辉周延春
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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