| The preparation, properties and applications of SiAlCN PDC (Polymer Derived Ceramics) were reviewed. There are four kinds of preparation methods for SiAlCN ceramics: (i) powder mixing: the precursor of polysilazane ceramics is directly mixed with alumina powder.(ii) powder dissolving: aluminum compound powder dissolved in polysilazane precursor solution; (iii) single-source precursor: aluminum atoms are grafted onto the main chain of polysilazane by appropriate aluminum-containing compounds to form a single-source ceramic precursor, polyalumi-nosilazane; (iv) polymer mixing: two polymers, polysilazanes and aluminum-containing polymers are blended . Then the SiAlCN ceramics were prepared by crosslink and pyrolysis. Compared with Al free Si/C and Si/C/N systems, SiAlCN ceramics have excellent creep resistance, better oxidation resistance and corrosion resistance, and better thermal conductivity. Therefore, polymer-derived SiAlCN ceramics are promising materials for high temperature and harsh environment applications. |
