In this paper, the polymer precursor derived ceramic (PDC) method, that was used to fabricate the silicon carbide (SiC) ceramic composite coatings on metallic substrates, was briefly summarized. Two different fabrication mechanism of ceramic coatings by PDC method were mainly introduced. One was that Al powder as the active fillers converted into AlN due to the action with N2. The other was that Al powder as the active fillers converted into Al2O3 due to the action with O2. So fabrication mechanism of ceramic coatings by PDC method would be still the research focus in the future. Compared with the other methods, the advantages and disadvantages of PDC method preparing ceramic coatings were displayed. According to the existent problems and future development direction of PDC method, the key research objectives were presented.
The preparation of electrolyte and the technical flow were summarized, the chromium based nanodiamond composite coating was prepared by composite plating process. The metallography structure of plating layer was characterzied, and the hardness, the element of plating layer were tested, the test results and reaction principle were discussed. It was found that the addition of nanodiamond increased the hardness of the coatings. When the concentration of DND in electrolyte is 2.0-3.0g/L,the plating time is about 15-20min, the maximum hardness was obtained.
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