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首页> 外文期刊>RSC Advances >Effect of the BN content on the thermal shock resistance and properties of BN/SiO2 composites fabricated from mechanically alloyed SiBON powders
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Effect of the BN content on the thermal shock resistance and properties of BN/SiO2 composites fabricated from mechanically alloyed SiBON powders

机译：BN含量对机械合金合金粉末制造的BN / SiO2复合材料的热抗冲击性和性能的影响

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摘要

Wave-transparent composites of BN/SiO2 were prepared via hot pressure sintering at 1650 degrees C of mechanically alloyed amorphous SiBON powders. The mechanical, dielectric and thermal properties and thermal shock resistance of the composites were carefully investigated with different BN contents. With increasing BN content, the flexural strength and fracture toughness of the composites increased first and then decreased. The sample with the composition of SiO2-5BN exhibited the highest flexural strength of 256.3 MPa and a fracture toughness of 3.15 MPa m(1/2). The relative density decreased with the increase of BN content, which would influence the thermal properties and the thermal shock resistance of the composites. The formation of borosilicate glass and crystallization of fused silica in the surface at the high temperature greatly improved thermal shock resistance of the samples. The SiO2-6BN sample, possessing low relative density, exhibited the best thermal shock resistance, and the retained strength after a thermal shock of 1100 degrees C was 98.6% of the original strength. Besides excellent mechanical and thermal properties and thermal shock resistance, the as-sintered composites exhibited low dielectric constant (epsilon < 4.62) and loss tangent (tan delta < 0.002), meeting the required values for high temperature wave-transparent materials.
机译：BN /二氧化硅的透波复合材料通过热压制备在机械合金化非晶SiBON粉末的1650摄氏度烧结。机械，电介质和热性能和复合材料的耐热冲击性进行了仔细调查不同BN内容。随着BN含量，复合材料的弯曲强度和断裂韧性先增大后减小。与SiO2-5BN的组合物中的样品表现出256.3兆帕的最高弯曲强度和3.15兆帕米（1/2）的断裂韧度。相对密度与BN含量的增加，这将影响热性能和复合材料的耐热冲击性降低。硼硅酸盐玻璃和熔融石英的结晶在表面在高温下的形成极大地提高了样品的耐热冲击性。的SiO2-6BN样品，具有低相对密度，表现出最好的抗热震性，和1100度C为原强度98.6％的热冲击后的残留强度。除了优异的机械性能和热性能和抗热震性，则作为烧结复合材料表现出低的介电常数（ε-<4.62）和损耗角正切（损耗角正切值<0.002），在满足所需的值用于高温透波材料。

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  • 来源
    《RSC Advances》 |2017年第77期|共10页
  • 作者

    Li Quan; Yang Zhihua; Miao Yang; Liang Bin; Cai Delong; Wang Shengjin; Duan Xiaoming; Jia Dechang; Zhou Yu;

  • 作者单位

    Harbin Inst Technol Sch Mat Sci &

    Engn Inst Adv Ceram Harbin 150080 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Inst Adv Ceram Harbin 150080 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Inst Adv Ceram Harbin 150080 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Inst Adv Ceram Harbin 150080 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Inst Adv Ceram Harbin 150080 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Inst Adv Ceram Harbin 150080 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Inst Adv Ceram Harbin 150080 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Inst Adv Ceram Harbin 150080 Heilongjiang Peoples R China;

    Harbin Inst Technol Sch Mat Sci &

    Engn Inst Adv Ceram Harbin 150080 Heilongjiang Peoples R China;

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