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Method for preparing silicon carbide/molybdenum disiticide composite coating on surface of carbon material

A molybdenum disilicide and composite coating technology, which is applied in the field of preparing silicon carbide/molybdenum disilicide composite coatings, can solve the problems of low bonding strength between the coating and the substrate, weak bonding force and high porosity of the coating, and achieves good High temperature oxidation resistance and mechanical properties, improving binding force, economical and simple effect

Inactive Publication Date: 2013-11-13
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the cost is high, the acid product generated by the reaction will seriously corrode the equipment, and the bonding strength between the coating and the substrate is not high
(3) MoSi prepared by plasma spraying method 2 The coating has high porosity, the coating and the substrate are mechanically adhered, and the bonding force is weak, so it cannot act as an oxygen diffusion barrier

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Set the density to 1.80g / cm 3 The carbon / carbon composite materials were polished with 400, 800 and 1000 mesh sandpaper in turn, cleaned with ultrasonic waves, and dried in a drying oven at 100 °C.

[0015] Will MoO 3 Mix well with NaCl, and the atomic mass of Mo contained in it is 10wt% of NaCl.

[0016] Put the sample and mixed salt into a sealed graphite crucible, keep it warm at 900°C for 4 hours in a vacuum environment, and cool to room temperature with the furnace. After the sample was taken out, it was washed and dried to obtain Mo 2 C-coated samples.

[0017] Mix 2wt% Si powder, 30wt% NaF and the rest KCl evenly to obtain molten salt infiltration.

[0018] will have prepared Mo 2 C-coated samples were embedded in molten salt infiltrates and placed in sealed graphite crucibles. In a vacuum environment, keep warm at 900°C for 4 hours, cool to room temperature with the furnace, take out the sample, wash and dry to obtain SiC / MoSi 2 Composite coating samples....

Embodiment 2

[0020] Set the density to 1.75g / cm 3 The graphite was polished with 400, 800 and 1000 mesh sandpaper in turn, cleaned with ultrasonic waves, and dried in a drying oven at 120 °C.

[0021] Mix ammonium orthomolybdate and KCl evenly, and the Mo atomic mass contained in it is 20wt% of KCl.

[0022] Put the sample and mixed salt into a sealed alumina crucible, keep it warm at 950°C for 3 hours in a vacuum environment, and cool to room temperature with the furnace. After the sample was taken out, it was washed and dried to obtain Mo 2 C-coated samples.

[0023] Mix 8wt% of Si powder, 20wt% of NaF and the rest of NaCl evenly to obtain molten salt infiltration.

[0024] will have prepared Mo 2 C-coated samples were embedded in molten salt infiltrates and placed in sealed graphite crucibles. Under the protection of inert gas, keep warm at 950°C for 3 hours, cool to room temperature with the furnace, take out the sample, wash and dry to obtain SiC / MoSi 2 Composite coating samples...

Embodiment 3

[0026] Set the density to 1.85g / cm 3 The carbon / carbon composite materials were polished with 400, 800 and 1200 mesh sandpaper in turn, cleaned with ultrasonic waves, and dried in a drying oven at 130 °C. .

[0027] Mix ammonium paramolybdate and ammonium dimolybdate with NaCl and KCl at a molar ratio of 1:1, and the atomic mass of Mo contained therein is 30wt% of that of NaCl and KCl.

[0028] Put the sample and mixed salt into a sealed alumina crucible, and keep it at 1000°C for 2 hours under the protection of inert gas, and then cool to room temperature with the furnace. After the sample was taken out, it was washed and dried to obtain Mo 2 C-coated samples.

[0029] Mix 15wt% Si powder, 10wt% NaF, and NaCl and KCl with a molar ratio of 1:1 to obtain molten salt infiltration.

[0030] will have prepared Mo 2 C-coated samples were embedded in molten salt infiltrates and placed in sealed graphite crucibles. Under the protection of inert gas, keep warm at 1000°C for 2 ho...

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Abstract

The invention discloses a method for preparing a silicon carbide / molybdenum disiticide composite coating on the surface of a carbon material. The method comprises: A, uniformly mixing one or more of MoO3, ammonium molybdate, ammonium heptamolybdate, ammonium dimolybdate and ammonium tetramolybdate with one or more of alkali chlorides, wherein the mass percent ratio of the contained Mo atom to the mixed salt is 10-40%; B, embedding a carbon / carbon composite material or graphite in the mixed salt of the step A, placing in an sealed crucible, keeping warm at a temperature of 800-1100 DEG C for 0.5-5 h, cooling along with the crucible to room temperature; C, uniformly mixing one or more of Si powder, NaF and alkali chlorides; and D, embedding the carbon material obtained from the step B in the mixed salt bleed of the step C, keeping warm at a temperature of 900-1100 DEG C for 0.5-4 h, and cooling along with the crucible to room temperature. The method helps to make the material have good high-temperature antioxidation performance and mechanical properties.

Description

technical field [0001] The invention relates to a method for preparing a silicon carbide / molybdenum disilicide composite coating on the surface of a carbon material. Background technique [0002] Carbon materials (such as carbon / carbon composite materials, graphite, etc.) have many excellent properties, such as low density, low linear expansion coefficient, excellent friction and wear resistance, good thermal conductivity, etc., and are widely used in aerospace, metallurgy, chemical and fields of atomic energy. However, carbon materials begin to oxidize at 400°C in air, and the weight loss in oxidation seriously damages and affects the structure and performance of carbon materials, which limits their application as high-temperature refractory materials. Especially with the development of aerospace technology, large-scale thin-walled carbon / carbon composite parts for thermal structures have put forward higher requirements for high-temperature oxidation resistance. Therefore...

Claims

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Application Information

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IPC IPC(8): C04B41/87
Inventor 彭可周文艳易茂中邓雄冉丽萍葛毅成
Owner CENT SOUTH UNIV
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