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Ti2AlN/TiB2 composite and preparation method thereof

A titanium diboride and composite material technology is applied in the field of ceramic matrix composite materials, which can solve the problems of rareness, restrict the popularization and application of Ti2AlN, and high cost, and achieve the effect of pure interface, favorable for densification, and low cost.

Inactive Publication Date: 2014-01-15
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

In other aspects, the current preparation of Ti 2 AlN ceramic raw materials usually use high-cost materials such as TiN and AlN, which limits the 2 Promotion and application of AlN
At present, on the in situ particle reinforced Ti 2 Reports of AlN are still very rare

Method used

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  • Ti2AlN/TiB2 composite and preparation method thereof
  • Ti2AlN/TiB2 composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 7.5 grams of hexagonal boron nitride powder with a particle size of 0.5-10 microns, 8.2 grams of aluminum powder with a particle size of 200 mesh and 34.3 grams of titanium powder with a particle size of 200 mesh are ball milled in a polyurethane ball milling tank for 24 hours, and then placed in a graphite mold for cold pressing For molding, the applied pressure is 20MPa and the pressure is maintained for 10 minutes; then, it is placed in a hot pressing furnace for hot pressing and sintering at a heating rate of 20°C / min, heated to 900°C for 2 hours, while the pressure is gradually increased to 40MPa. The entire sintering process is carried out under the protection of argon (or helium). In this embodiment, the composite material is mainly composed of Ti 2 AlN and TiB 2 Two-phase composition, the molar ratio of aluminum titanium nitride to titanium diboride in the composite material is 2:1, and the crystal grain size of titanium diboride is 0.2 to 1 micron. The material ...

Embodiment 2

[0025] 7.5 grams of hexagonal boron nitride powder with a particle size of 0.5-10 microns, 8.2 grams of aluminum powder with a particle size of 200 mesh and 34.3 grams of titanium powder with a particle size of 300 mesh were ball milled in a polyurethane ball milling tank for 12 hours, and then put into a graphite mold for cold pressing For molding, the applied pressure is 15 MPa and the pressure is maintained for 10 minutes; then, it is placed in a hot pressing furnace for hot pressing and sintering at a heating rate of 15 °C / min, heated to 1400 °C for 1 hour, while the pressure is gradually increased to 30 MPa. The entire sintering process is carried out under argon protection. The obtained reaction product was subjected to XRD analysis (see figure 1 ), it can be found that the prepared composite material only consists of Ti 2 AlN and TiB 2 Two-phase composition, the molar ratio of aluminum titanium nitride to titanium diboride in the composite material is 2:1, and the crystal...

Embodiment 3

[0027] 7.5 grams of hexagonal boron nitride powder with a particle size of 0.5-10 microns, 8.2 grams of aluminum powder with a particle size of 300 mesh, and 34.3 grams of titanium powder with a particle size of 200 mesh are ball milled in a polyurethane ball milling tank for 8 hours, and then placed in a graphite mold and cold pressed For molding, the applied pressure is 10MPa, and the pressure is maintained for 5 minutes; then, it is placed in a hot pressing furnace for hot pressing and sintering at a heating rate of 1 to 5°C / min, heated to 1600°C for 0.5 hours, while the pressure is gradually increased to 10MPa. The entire sintering process is carried out under argon protection. In this embodiment, the composite material is made of Ti 2 AlN and TiB 2 Two-phase composition, the molar ratio of aluminum titanium nitride to titanium diboride in the composite material is 2:1, and the crystal grain size of titanium diboride is 0.2 to 1 micron. The material performance test shows: ...

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Abstract

The invention relates to the field of ceramic matrix composites, in particular to a Ti2AlN / TiB2 composite and a preparation method thereof. The composite is formed by uniformly dispersing TiB2 particle reinforced phases at a Ti2AlN matrix, wherein a mole ratio of Ti2AlN to TiB2 in the composite is 2:1, and a grain size of TiB2 is below 1 micrometer. The method comprises the steps that raw materials: namely titanium powder, aluminum powder and boron nitride powder at a mole ratio of 5:2:2 are mixed by a physical mechanical method for 8-24h, placed in a graphite jig for cold press moulding at 10-20MPa, and sintered in a hot-press furnace supplied with an inert gas shielding atmosphere at a heating rate of 1-20 DEG C per minute, at 900-1600 DEG C for 0.5-2h, and at 10-40MPa. The method can achieve TiB2 particle in-situ synthesis and reinforce the Ti2AlN matrix, and the conductivity, the hardness and the flexural strength of the composite are improved greatly compared with those of pure Ti2AlN.

Description

Technical field [0001] The invention relates to the field of ceramic matrix composite materials, in particular to an in-situ synthesis of titanium diboride (TiB 2 ) Particle reinforced titanium aluminum nitride (Ti 2 AlN)-based composite material and its preparation method. Background technique [0002] Ti 2 AlN is a new type of ternary layered ceramic material. Literature 1: Scripta Mater..2007(56):1115-1118 The research of Lin et al. showed that it combines the many advantages of ceramics and metals, and has the characteristics of low density, high modulus, and thermal shock resistance. Therefore, it is used in aviation and aerospace. , Nuclear industry, fuel cell, electronic information and other high-tech fields have potential wide application prospects. [0003] Due to pure Ti 2 AlN has low strength and hardness, which limits its application as a structural material. The introduction of hard ceramic particles is one of the effective methods to improve the strength of ternary...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/58C04B35/622
Inventor 陈继新赵国瑞周延春
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI