Method for preparing high-purity MAX-phase ceramic powder

A ceramic powder, high-purity technology, applied in the field of preparation of high-purity MAX phase ceramic powder, can solve the problems of high product content, long heat treatment time, high sintering temperature, etc., to promote diffusion, excellent shape, and reduce reaction The effect of temperature

Inactive Publication Date: 2012-08-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned processes generally have one or more of many disadvantages such as complicated process, polluting the environment, more impurities in the obtained product, too high sintering temperature, and long heat treatment time, which is not conducive to the promotion of large-scale industrialization

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  • Method for preparing high-purity MAX-phase ceramic powder
  • Method for preparing high-purity MAX-phase ceramic powder
  • Method for preparing high-purity MAX-phase ceramic powder

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Effect test

Embodiment 1

[0025] In this embodiment, the MAX phase ceramic material is Ti 3 SiC 2 , the following is the Ti 3 SiC 2 The specific preparation method of powder:

[0026] Weigh 23.9352g of titanium powder, 5.6180g of silicon powder, and 4.0032g of graphite according to the Ti / Si / C molar ratio of 3:1.2:2, and use agate as a ball on a planetary ball mill at a mass ratio of 1:1 to 80r. / min dry mixing for 12 hours, and sieve the obtained powder after ball milling. A certain amount of sieved powder was weighed and placed in a mold to be pre-pressed at a pressure of 5 MPa, and then microwave sintered in a 2.45GHz-HAMiLab-3V high vacuum microwave sintering furnace. The heating rate was controlled at 5°C / min by adjusting the power. After the temperature was raised to 1400°C, it was kept for 45 minutes, then the microwave source was turned off, and it was cooled with the furnace under an Ar atmosphere. The loose block obtained after cooling is taken out and ground to obtain the MAX phase Ti ...

Embodiment 2

[0029] In this embodiment, the MAX phase ceramic material is Ti 3 SiC 2 , the Ti 3 SiC 2 The specific preparation method of powder:

[0030] Weigh 23.9352g of titanium powder, 4.6817g of silicon powder, and 4.0032g of graphite according to the Ti / Si / C molar ratio of 3:1:2, and use agate as a ball on a planetary ball mill at a mass ratio of 2:1 to 100r / min dry mixing for 10 hours, and the resulting powder was sieved after ball milling. A certain amount of sieved powder was weighed and placed in a mold to be pre-pressed at a pressure of 10 MPa, and then microwave sintered in a 2.45GHz-HAMiLab-3V high vacuum microwave sintering furnace. The heating rate was controlled at 10°C / min by adjusting the power, and the temperature was raised to 1350°C and then kept for 60 minutes, then the microwave source was turned off, and the furnace was cooled in an Ar atmosphere. The loose block obtained after cooling is taken out and ground to obtain the MAX phase Ti 3 SiC 2 Powder.

[00...

Embodiment 3

[0033] In this embodiment, the MAX phase ceramic material is Ti 3 SiC 2 , the Ti 3 SiC 2 The specific preparation method of powder:

[0034] Weigh 23.9352g of titanium powder, 7.0226g of silicon powder, and 4.0032g of graphite according to the Ti / Si / C molar ratio of 3:1.5:2, and use agate as a ball on a planetary ball mill at a mass ratio of 3:1 to 120r. / min dry mixing for 6 hours, and the resulting powder was sieved after ball milling. A certain amount of sieved powder was weighed and placed in a mold to be pre-pressed at a pressure of 20 MPa, and then microwave sintered in a 2.45GHz-HAMiLab-3V high vacuum microwave sintering furnace. The heating rate was controlled at 15°C / min by adjusting the power, and the temperature was raised to 1450°C and then kept for 30 minutes, then the microwave source was turned off, and the furnace was cooled in an Ar atmosphere. The loose block obtained after cooling is taken out and ground to obtain the MAX phase Ti 3 SiC 2 Powder.

[...

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Abstract

The invention discloses a method for preparing high-purity MAX-phase ceramic powder. The method includes approximately weighing raw materials according to stoichiometric ratios of various elements in a chemical formula of a MAX-phase ceramic material at first; then uniformly mixing the raw materials by the aid of a ball mill, placing mixture of the raw materials in a mold and prepressing the mixture to obtain a prepressed intermediate body; and finally placing the prepressed intermediate body into a special microwave oven, controlling the temperature rise rate by means of adjusting the microwave power in inertial atmosphere, increasing the temperature to a sintering temperature, keeping heat for a certain period, realizing furnace cooling to the room temperature, and grinding the mixture to obtain the MAX-phase ceramic powder with high purity, an excellent shape and a unique layered structure. The method for preparing the MAX-phase ceramic powder is speedy, efficient, energy-saving and environment-friendly and is low in cost and easy to realize large-scale production.

Description

technical field [0001] The invention relates to the technical field of MAX phase ceramic materials, in particular to a preparation method of high-purity MAX phase ceramic powder. Background technique [0002] On the one hand, MAX-phase ceramics have excellent machinability, thermal conductivity, and electrical conductivity of metal materials; on the other hand, they have the characteristics of corrosion resistance and oxidation resistance of ceramic materials, so they are called cermets. Its unique nano-layered structure endows MAX phase ceramics with good self-lubrication and certain damage tolerance. As a lubricant, its lubricating effect is comparable to that of commonly used solid lubricants such as graphite and molybdenum disulfide; and the damage tolerance allows it to withstand a certain deformation at room temperature without brittle fracture. Better plasticity. The many excellent properties of MAX phase ceramics make this type of ceramics very useful in high tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/56
Inventor 黄庆胡春峰汪乾
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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