Preparation of sic/sio on the surface of graphite materials for reactors 2 Composite high temperature anti-oxidation coating and composite materials

A technology of high-temperature anti-oxidation, graphite material, applied in the field of nuclear applications, can solve the problems of large particle size of coating slurry, difficult to uniform coating thickness, unsatisfactory micropore impregnation, etc., to achieve excellent anti-oxidation performance and ease thermal expansion Coefficient difference, the effect of improving thermal shock resistance

Active Publication Date: 2017-03-01
TSINGHUA UNIV
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Problems solved by technology

This method is simple in process and low in cost, but the particle size in the coating slurry is large, which is not ideal for impregnating the micropores in the matrix material; at the same time, the coating prepared by this method has a high sintering temperature, poor density, and is easy to crack. The thickness of the coating is not uniform and the surface is rough

Method used

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  • Preparation of sic/sio on the surface of graphite materials for reactors <sub>2</sub> Composite high temperature anti-oxidation coating and composite materials

Examples

Experimental program
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Effect test

Embodiment 1

[0078] The first mixed powder composition formula: 60wt% silicon powder, 20wt% silicon carbide powder, 10wt% alumina powder, 10wt% natural graphite powder;

[0079] The second mixed powder composition formula: 80wt% silicon powder, 2wt% alumina powder, 18wt% natural graphite powder;

[0080] Preparation method: put silicon powder, silicon carbide powder, alumina powder and natural graphite powder in a ball mill tank according to the first mixed powder composition formula, add acetone, adjust the speed of the ball mill to 300rpm, and mix for 4 hours after ball milling, then take it out at 120 Dry in a vacuum drying oven at ℃ for 2 hours and sieve to obtain the first mixed powder. Similarly, silicon powder, alumina powder and natural graphite powder are mixed in a ball mill according to the composition formula of the second mixed powder to obtain the second mixed powder. Second, mix the powder, then bury the graphite material in the graphite crucible filled with the first mixed ...

Embodiment 2

[0082] The first mixed powder composition formula: 55wt% silicon powder, 20wt% silicon carbide powder, 10wt% alumina powder, 15wt% natural graphite powder;

[0083] The second mixed powder composition formula: 85wt% silicon powder, 5wt% alumina powder, 10wt% natural graphite powder;

[0084] Preparation method: the same as in Example 1, wherein the first sintering is carried out at 1600° C. for 3 hours under vacuum atmosphere, the second sintering is carried out at 1800° C. for 3 hours under vacuum atmosphere, and the oxidation treatment is carried out at 1600° C. under static air atmosphere. °C for 2 hours.

Embodiment 3

[0086] The first mixed powder composition formula: 60wt% silicon powder, 25wt% silicon carbide powder, 5wt% alumina powder, 10wt% natural graphite powder;

[0087] The second mixed powder composition formula: 75wt% silicon powder, 5wt% alumina powder, 20wt% natural graphite powder;

[0088] Preparation method: Same as Example 1, wherein the first sintering is carried out at 1700°C for 3 hours under vacuum atmosphere, the second sintering is carried out at 1850°C for 3 hours under vacuum atmosphere, and the oxidation treatment is carried out at 1650°C under static air atmosphere. °C for 2 hours.

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Abstract

The invention discloses a method for preparing a SiC / SiO2 composite high-temperature oxidation resistant coating from the surface of a graphite material at a reactor and a composite material. The method comprises the following steps: (1) mixing silica powder, silicon carbide powder, alumina powder and graphite powder, so as to obtain mixed powder; (2) mixing silica powder, alumina powder and graphite powder, so as to obtain second mixed powder; (3) embedding the graphite material with the first mixed powder, so as to obtain a first embedded material; (4) sintering the first embedded material, so as to obtain a first sintered material; (5) embedding the first sintered material into the second mixed powder, so as to obtain a second embedded material; (6) sintering the second embedded material, so as to obtain a second sintered material; and (7) oxidizing the second sintered material, so as to obtain the SiC / SiO2 composite high-temperature oxidation resistant coating. According to the method, the SiC / SiO2 composite high-temperature oxidation resistant coating with uniform thickness, thermal shock resistance and excellent oxidation resistance can be prepared from the surface of the graphite material at the reactor.

Description

technical field [0001] The invention belongs to the technical field of nuclear application, in particular, the invention relates to a method for preparing SiC / SiO on the surface of reactor graphite material 2 Composite high temperature anti-oxidation coating and composite materials. Background technique [0002] Graphite is one of the foundations on which nuclear reactors are built. It is not only the main component of reactor structural support materials and shielding materials, but also the matrix material of the fourth-generation high-temperature gas-cooled reactor fuel elements. Therefore, the research on graphite materials is of great importance to the safety and security of reactors. Development is very important. Graphite materials have outstanding advantages such as high temperature resistance, small neutron absorption cross-section, stable chemical properties, and excellent high-temperature mechanical properties. The biggest disadvantage is that it is easy to react...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85
Inventor 周平赵宏生李自强张凯红刘小雪刘兵唐春和
Owner TSINGHUA UNIV
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