Fabrication and microstructural evaluation of ZrB2/ZrC/Zr composites by liquid infiltration
Fabrication and microstructural evaluation of ZrB2/ZrC/Zr composites by liquid infiltration
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DOI：
10.1007/bf01171540
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发表时间：
1994-10
影响因子：
4.5
通讯作者：
S. Woo;C. Kim;E. Kang
中科院分区：
文献类型：
--
作者：
S. Woo;C. Kim;E. Kang
采用扫描电子显微镜、光学显微镜和X射线衍射技术研究了ZrB 2/ZrC/Zr复合材料的微观结构。采用ZrB 2预制体与锆液反应烧结，可制备出致密的ZrB 2/ZrC/Zr复合材料。在1900 ℃下将熔融锆熔渗到B4 C含量为0-40 vol%的ZrB 2预制体中10 min，制备了复合材料。随着B4 C体积分数的增加，反应烧结复合材料中ZrB 2的平均晶粒尺寸略有减小。固相体积分数随B4 C含量的进一步增加而增加。根据B4 C含量测量机械性能。该复合材料具有高达570 MPa的四点弯曲强度和高达11.5 MPa m1/2的断裂韧性。
The microstructure of ZrB2/ZrC/Zr composites was examined using scanning electron microscopy, optical microscopy, and X-ray diffraction techniques. Dense ZrB2/ZrC/Zr composites could be fabricated by the reaction sintering of molten zirconium with ZrB2preform. The composites were made by infiltration of molten zirconium into ZrB2preform, which contained 0–40 vol% B4C, at 1900‡C for 10 min. The average grain size of ZrB2in the reaction-sintered composites decreased slightly with an increase in the volume fraction of the B4C. The volume fraction of the solid increased with further increase of B4C contents. The mechanical properties were measured in accordance with B4C contents. The composites exhibited a four-point bending strength of up to 570 MPa and a fracture toughness of up to 11.5 MPa m1/2.