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Preparation method of highly-densified titanium carbide ceramic

A densification and titanium carbide technology, which is applied in the field of preparation of highly densified titanium carbide ceramics, can solve problems such as poor thermophysical properties, low production efficiency, and affecting the use of materials

Inactive Publication Date: 2016-04-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above method mainly has the following problems: 1. The addition of some sintering aids still requires methods such as hot pressing and sintering to realize the densification of materials, but the temperature of hot pressing and sintering can be appropriately reduced, resulting in low production efficiency and high cost; 2. The thermophysical properties of most metals and their alloy sintering aids are poorer than those of ceramic substrates, which greatly reduces the performance of sintered materials, especially the high temperature thermophysical properties, thus affecting the use of materials

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preparation example Construction

[0022] The invention belongs to a method for preparing ceramic materials, in particular to a method for densification of titanium carbide ceramics under normal pressure sintering. Taking sub-micron titanium carbide powder (sub-micron TiC powder with an average particle size of less than 0.5μm) as the main raw material, introducing reducing carbide sintering aids, using WC, B 4 C, Cr 3 C 2 One or more of VC, C, etc. are sintering aids. After mixing, forming and debonding according to the conventional ceramic technology, sintering under the protection of argon atmosphere can realize the atmospheric sintering and densification of titanium carbide ceramics. The density of the material after sintering can reach above 98% TD (theoretical density).

[0023] The added amount of the sintering aid is 0-10 wt% of the mass of the titanium carbide powder.

[0024] The titanium carbide powder used is a commercial powder, and the particle size is sub-micron (or can reach sub-micron after ball mil...

Embodiment 1

[0032] 1. Using commercial TiC powder with an average particle size of 0.37μm as the main raw material, adding sintering aid C to 3wt%, after ball milling the mixture, pressing test strips (20MPa / 30s), cold isostatic pressing (200MPa / 120s) , After debonding (heating rate 5°C / min, debonding temperature 1200°C, holding time 3 hours), atmospheric sintering is carried out. The size of the titanium carbide ceramic material blank is: 45.5×8×6mm;

[0033] 2. Under argon atmosphere, the pressure in the furnace is maintained at a standard atmospheric pressure for normal pressure sintering, the sintering temperature is 2250℃, and the sintering time is 2 hours;

[0034] The density of TiC ceramic sintered body can reach 98.8%;

[0035] Such as figure 1 As shown, the sintering aid C in the TiC ceramic sintered body is uniformly distributed in the TiC ceramic matrix.

Embodiment 2

[0037] 1. Using commercial TiC powder with an average particle size of 0.37μm as the main raw material, adding sintering aid B4C at 8wt%, after ball milling the mixture, pressing test strips (20MPa / 30s), cold isostatic pressing (200MPa / 120s), After debonding (heating rate 0.5°C / min, debonding temperature 900°C, holding time 0.5 hours), atmospheric sintering is carried out. The size of the titanium carbide ceramic material blank is: 45.5×8×6mm;

[0038] 2. Under argon atmosphere, the pressure in the furnace is maintained at about a standard atmospheric pressure for normal pressure sintering, the sintering temperature is 2200℃, and the sintering time is 2 hours. The density of the TiC ceramic sintered body can reach 100%;

[0039] Such as figure 2 As shown, TiB formed by the reaction of sintering aid B4C with TiC in TiC ceramic sintered body 2 Evenly distributed in the TiC ceramic matrix.

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Abstract

The invention relates to a preparation method of highly-densified titanium carbide ceramic. The method comprises: 1) taking TiC powder and a sintering aid, and performing mixing, molding, and debinding treatment to obtain TiC ceramic biscuit, wherein the sintering aid is at least one of WC, B4C, Cr3C2, VC, and C; and 2) sintering the TiC ceramic biscuit prepared in the step 1) under a normal pressure, at a temperature of 2100-2500 DEG C, and in an inert gas atmosphere to obtain the densified titanium carbide ceramic.

Description

Technical field [0001] The invention relates to a method for preparing ceramic materials, in particular to a method for preparing high-density titanium carbide ceramics. Background technique [0002] Titanium carbide (TiC) ceramics have a low density (4.93g / cm 3 ), high melting point (3160℃), high hardness (Knoop hardness ~ 32GPa), high conductivity (3.0×10 7 S / m), good thermochemical stability and wear resistance, etc., which are widely used in extreme environments such as high temperature, corrosion and wear, such as cutting tools, wear-resistant coatings, bulletproof materials, turbine engine seals and nuclear reactor components Wait. [0003] However, TiC materials have strong sintering inertness, and it is difficult to obtain high-density sintered bodies by normal pressure sintering. At present, methods such as hot pressing sintering and spark plasma sintering are mainly used to achieve its densification. However, these equipments are complicated and expensive, and can only p...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/64
Inventor 张辉黄政仁刘学建
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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