High-temperature-resistance and anti-ablation composite coating and preparation method thereof
A composite coating, anti-ablation technology, applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problem of unfavorable ZrC coating anti-ablation performance, chemical incompatibility, poor quality of composite coating and other problems, to achieve the effect of controllable coating thickness, low cost and low porosity
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[0048] Preparation of ZrC-TiC composite powder. ZrC powder and TiC powder are mixed according to a certain volume ratio to obtain ZrC-TiC composite powder. Among them, the content of TiC is 5-40 vol.%, preferably 10-30 vol.%. When the content of TiC is 10-30 vol.%, the obtained ZrC-TiC composite coating has a low mass loss rate and good ablation resistance The advantages. The mixing method can be a planetary ball mill. In the case of planetary ball milling, the mixing process includes, for example, mixing by ball milling with absolute ethanol as the medium. The mixing time can be 2 to 5 hours, and the uniformly mixed powder can be mixed in the temperature range of 80 to 120 ℃ Dry for 5-30 hours to obtain a composite powder of raw materials. The purity of the ZrC powder used is ≥98.0%, and the particle size of the powder is in the range of 5 to 90μm; the purity of TiC powder is ≥98.0%, and the particle size of the powder is in the range of 5 to 90μm. The selection of high-pur...
Embodiment 1
[0059] A high-temperature and ablation-resistant composite coating composed of a main phase of 80vol.% ZrC and a second phase of 20vol.% TiC. The particle size of the ZrC powder ranges from 10 to 80 μm and the purity is 99.0 wt.% ; The particle size of TiC powder ranges from 10 to 90 μm, and the purity is 99.0wt.%. The preparation of the above composite coating is carried out according to the following steps:
[0060] (1) Using the C / C composite material with SiC transition layer as the matrix, the matrix is subjected to surface sandblasting treatment, the sandblasting pressure is 0.2MPa, using absolute ethanol as the medium, ultrasonic cleaning 2 times, each 10 minutes, in Dry in an oven at 100°C for 2 hours, ready for use;
[0061] (2) The ZrC and TiC powders are mixed by ball milling with anhydrous ethanol as a medium according to the volume ratio of 80:20, and dried at 100°C for 2 hours to obtain the raw material powder for use;
[0062] (3) Using vacuum plasma spraying techn...
Embodiment 2
[0069] A high-temperature and ablation-resistant composite coating composed of a 70vol.% ZrC main phase and a 30vol.% TiC second phase. The particle size of the ZrC powder ranges from 10 to 80 μm and the purity is 99.0 wt.% The particle size of TiC powder ranges from 10 to 90 μm, and the purity is 99.0wt.%. The preparation of the above composite coating is carried out according to the following steps:
[0070] (1) Using the C / C composite material with SiC transition layer as the matrix, the matrix is subjected to surface sandblasting treatment, the sandblasting pressure is 0.2MPa, using absolute ethanol as the medium, ultrasonic cleaning 2 times, 10 minutes each time, Dry in an oven at 100°C for 2 hours, ready for use;
[0071] (2) The ZrC and TiC powders are mixed by ball milling with anhydrous ethanol as a medium according to the volume ratio of 70:30 for 5 hours, and dried at 100°C for 2 hours to obtain the raw material powder for use;
[0072] (3) Using vacuum plasma spraying...
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