Synthesis of high-purity compact block aluminium titanium nitride ceramic material by discharge plasma sintering process

A discharge plasma and aluminum titanium nitride technology, which is applied in the field of ion sintering process to synthesize high-purity dense aluminum titanium nitride ceramic materials, achieves the effects of high yield, simple raw materials, and low synthesis temperature

Inactive Publication Date: 2007-02-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are TiN impurities in the synthesized product

Method used

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  • Synthesis of high-purity compact block aluminium titanium nitride ceramic material by discharge plasma sintering process

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Embodiment 1

[0024] Embodiment 1: The molar ratio of raw material powder is n(Ti):n(Al):n(TiN)=1:0.8:1.2; mix evenly, put into graphite mold, sinter in spark plasma sintering system, vacuum The degree is 2Pa. Rapidly raise the temperature to 600°C within 3 minutes, and after 600°C, at a heating rate of 80°C / min, the sintering temperature is 1100°C, and the temperature is kept at 30 MPa for 5 minutes. The density of the bulk material is 95.5%, Ti 2 The AlN content is 92%, measured on the INSTRON-1195 million mechanical testing machine, the compressive strength of the material is ≥800MPa, and the three-point bending strength σ b ≥500MPa, K IC ≥8MPa·m 1 / 2 .

Embodiment 2

[0025] Embodiment 2: The molar ratio of the raw material powder is n(Ti):n(Al):n(TiN)=1:1.2:0.7; mix evenly, put it into a graphite mold, in a hot pressing sintering system, in argon protection For sintering, the vacuum degree is 5Pa. The heating rate is 80°C / min, the sintering temperature is 1350°C, the pressure is 40MPa, and the temperature is kept for 80 minutes. The density of the bulk material is 97.2%, Ti 2 The AlN content is 87%. Measured on the INSTRON-1195 million mechanical testing machine, the compressive strength of the material is ≥800MPa, and the three-point bending strength σ b ≥500MPa, K IC ≥8MPa·m 1 / 2 .

Embodiment 3

[0026] Embodiment 3: The molar ratio of the raw material powder is n(Ti):n(Al):n(TiN)=1:0.6:1.8; mix evenly, put it into a graphite mold, in a hot press sintering system, in argon protection For sintering, the vacuum degree is 3Pa. The heating rate is 80°C / min, the sintering temperature is 1450°C, the pressure is 10MPa, and the temperature is kept for 40 minutes. The density of bulk material is 94.1%, Ti 2 The AlN content is 87%. Measured on the INSTRON-1195 million mechanical testing machine, the compressive strength of the material is ≥800MPa, and the three-point bending strength σ b ≥500MPa, K IC ≥8MPa·m 1 / 2 .

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Abstract

The invention discloses a preparing method of high-purity compact block aluminium titanium nitride ceramic material through discharging plasmid sintering technology, which comprises the following steps: weighing Ti powder, Al powder and TiN according to molar rate at 1:(0.6- 1.4):(0.7-1.8); blending evenly; placing in the graphite mould; sintering in the discharge plasmid sintering system under vacuum environment; setting the heating temperature at 5-80deg.c/min and sintering time for 1100-1450 deg.c; insulating for 5-20 min under 10-40Mpa.

Description

technical field [0001] The invention relates to the field of new structural materials, in particular to a spark plasma sintering process for synthesizing high-purity dense block aluminum titanium nitride ceramic materials. Background technique [0002] Titanium Aluminum Nitride (Ti 2 AlN) ceramics are one of the ternary layered compounds with a hexagonal structure. This class of compounds has very specific properties. They not only have some properties of ceramics, such as high temperature resistance, oxidation resistance, corrosion resistance, etc., but also have some properties of metals, such as mechanical machinability, thermal shock resistance, high temperature plasticity, electrical conductivity, thermal conductivity, etc., and have better Self-lubricating, and some reports say it also has pyroelectricity. Therefore, it is actually a class of compounds with both functions and structural integration. They have broad application prospects in the civil electromechanic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 梅炳初严明周卫兵朱教群田晨光王苹
Owner WUHAN UNIV OF TECH
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