Method for preparing oxygen-containing TiNx-refractory metal compound composite material

A technology of refractory metals and composite materials, which is applied in the field of preparation of oxygen-containing TiNx-refractory metal compound composite materials, to achieve the effects of uniform oxygen distribution, low sintering temperature and enhanced toughness

Inactive Publication Date: 2019-06-28
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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However, its toughness is still a problem

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  • Method for preparing oxygen-containing TiNx-refractory metal compound composite material
  • Method for preparing oxygen-containing TiNx-refractory metal compound composite material
  • Method for preparing oxygen-containing TiNx-refractory metal compound composite material

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[0021] The invention provides an oxygen-containing TiN x -The preparation method of refractory metal compound composite material, it specifically comprises the following steps:

[0022] S1, the raw material nano-scale TiN x Mix evenly with refractory metal compounds according to the preset ratio, where 0.3≤x≤1.1;

[0023] S2. Spread the mixed powder of TiNx and refractory metal compound on the bottom of the crucible, put the crucible into the muffle furnace and raise the temperature to 300-700°C, the heating rate is 10-50°C / min, and the temperature rises to the preset Keep warm for 1 to 10 minutes after temperature, during which TiN x Oxygen uptake transforms into amorphous TiN x o y , and then take it out and cool it to room temperature to prepare TiN with different oxygen content x - mixed powder of refractory metal compound;

[0024] S3, the different oxygen content TiN obtained in step S2 x - The refractory metal compound mixed powder is pre-pressed and dried under ...

Embodiment 1

[0028] Take 1g TiN 0.3 -Mo 2 C mixed powder, TiN 0.3 with Mo 2 The volume ratio of C is 7:3, the powders are all nano-scale powders, the grain size is about 50nm, no oxidation treatment is carried out, after 3MPa pre-pressure drying and six-sided top press hot-press sintering, the sintering temperature is 1300°C, and the temperature rises The rate is 10°C / min, the sintering pressure is 5GPa, and the temperature is kept for 10min to obtain TiN 0.3 -Mo 2 C composite sintered body.

[0029] The annealed TiN was analyzed by D / max-2500PC X-ray diffractometer 0.3 -Mo 2 The phase composition of the C mixed powder and the sintered body after hot pressing sintering is detected, such as figure 1 (a) and figure 2 (a). Target material: the equipment uses Cu target; characteristic spectral line, Cu kα 1 (λ=0.154056nm); Accelerating voltage: 40kV; Current: 200mA; Scanning speed: 4° / min; Measurement angle: 20°-80°.

Embodiment 2

[0031] Take 1g TiN 0.3 -Mo 2 C mixed powder is spread on the bottom of alumina crucible, TiN 0.3 with Mo 2 The volume ratio of C is 7:3, the powders are all nano-scale powders, the grain size is about 50nm, TiN 0.3 There is a high concentration of N vacancies in the grains, put the crucible into the muffle furnace, raise the temperature in the muffle furnace from 350 °C at a heating rate of 10 °C / min, take it out after holding for 1 min, and cool it to room temperature in the air to obtain Oxy-TiN 0.3 -Mo 2 Ccomposites.

[0032] oxygenated TiN 0.3 -Mo 2C mixed powder was pre-pressed and dried at 3 MPa and hot-pressed and sintered with a six-sided top press. The sintering temperature was 1300 °C, the heating rate was 10 °C / min, the sintering pressure was 5 GPa, and the heat preservation time was 10 min to obtain oxygen-containing TiN. 0.3 -Mo 2 C composite sintered body.

[0033] The phase composition of the annealed powder and the sintered body after hot pressing and...

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Abstract

The invention discloses a method for preparing an oxygen-containing TiNx-refractory metal compound composite material, which comprises the following steps: S1, the raw material TiNx and the refractorymetal compound are uniformly mixed according to a preset ratio, wherein 0.3<=x<=1. 1; S2, the mixed powder of the TiNx and the refractory metal compound is laid on the bottom of a crucible, the crucible is placed in a muffle furnace, the temperature is raised to 300-700 DEG C, and the temperature is raised to a preset temperature and then kept for 1-10 minutes. During the course, TiNx absorbs oxygen and is converted into at least one of amorphous TiNxOy, A-TiO2, and R-TiO2, wherein 0<y<1, and then The TiNx is taken out and air-cooled to room temperature to obtain the oxygen-containing TiNx-refractory metal compound composite material with a different oxygen content; according to the invention, the oxygen content in the TiNx-refractory metal compound mixed powder or sintered body can be controlled by controlling the temperature, the temperature preservation time and the sintering pressure, and the oxygen distribution is relatively uniform.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation and relates to an oxygen-containing TiN x - Preparation method of refractory metal compound composite material. Background technique [0002] TiN has many excellent properties such as high hardness, corrosion resistance, and high electrical conductivity. However, due to its high melting point (2950°C), difficulty in sintering, and high brittleness of sintered body, it has been prepared by mechanical alloying method (MA). Non-stoichiometric TiN x (x<1), so that the N content of the nano-powder particles after MA is low, the lattice constant is reduced compared with the stoichiometric TiN, the melting point is correspondingly reduced when the N content is reduced, and the sinterability of the powder is improved. The grain size is in the nanometer scale TiN x The powder can be sintered with high activity, which is beneficial to obtain TiN with high density and good mechan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622C04B35/626C04B35/645
Inventor 李艳国邹芹王明智赵玉成赵亮王志伟陈伟东党赏
Owner YANSHAN UNIV
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