The invention belongs to the technical field of ultra-high-temperature ceramics, and relates to a preparation method of an ultra-high-temperature ceramic material with high bending strength and fracture toughness, and the preparation method comprises the following steps: ultrasonically mixing silicon carbide fibers and silicon carbide particles, ball-milling with hafnium boride and zirconium boride, drying, and sintering to obtain the ultra-high-temperature ceramic material, wherein the length-diameter ratio of the silicon carbide fiber is not less than 50. Compared with the prior art, the ultrahigh-temperature ceramic prepared by the invention has excellent bending strength and fracture toughness which can reach 612 MPa and 9.21 MPa.m < 1/2 > respectively, and meets the requirements of high mechanical properties of hypersonic aircraft nose cones, rocket nozzles and scramjet engine parts.

    本发明属于超高温陶瓷技术领域,涉及一种具有高抗弯强度和断裂韧性的超高温陶瓷材料的制备方法,制备方法包括:将碳化硅纤维与碳化硅颗粒超声混合,再与硼化铪、硼化锆球磨,干燥,烧结,得到超高温陶瓷材料;其中,所述碳化硅纤维的长径比不小于50。与现有技术相比,本发明制备的超高温陶瓷具有优异的抗弯强度和断裂韧性,分别可达到612MPa和9.21MPa·m1/2,满足高超声速飞行器鼻锥、火箭喷嘴以及超燃冲压发动机部件高力学性能的需要。


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    Title :

    Preparation method of ultrahigh-temperature ceramic material with high bending strength and fracture toughness


    Additional title:

    具有高抗弯强度和断裂韧性的超高温陶瓷材料的制备方法


    Contributors:
    ZHEN QIANG (author) / LI JIAXI (author) / ZHENG FENG (author) / MAO XIAODONG (author) / BU NAIJING (author)

    Publication date :

    2024-01-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    C04B Kalk , LIME / B64C AEROPLANES , Flugzeuge / F02K JET-PROPULSION PLANTS , Strahltriebwerke




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