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High-strength SiC composite ceramic and preparation method thereof
The invention belongs to the technical field of multiphase ceramic materials, and particularly relates to high-strength silicon carbide (SiC) multiphase ceramic and a preparation method thereof. According to the preparation method, two sintering modes of hot pressing sintering and discharge plasma sintering are adopted, yttrium oxide (Y2O3) is taken as a sintering aid, and aluminum nitride (A1N), titanium diboride (TiB2) and vanadium carbide (VC) are taken as reinforcing phases, so that the SiC complex-phase (SiC-AlN-VC-TiB2) ceramic is prepared. The main phase of the SiC composite ceramic is a solid solution of hexagonal SiC and A1N, and TiB2 and VC exist in the form of a second phase. The crystalline degree of each phase in the SiC composite ceramic is very good, the density, hardness and bending strength of the SiC composite ceramic are very high, and the SiC composite ceramic has good wear resistance. In the hot pressing sintering process, the density is increased to 99.2% from 91.8%; the ceramic hardness is improved by about 4 GPa, the bending strength is improved by about 84 MPa, and the volume wear rate is only 2.43 * 10 <-5 > mm < 3 >/Nm. In the SPS sintering process, the density of the composite ceramic is improved by about 3%; after the sintering aid is introduced, the hardness and bending strength of the composite ceramic are greatly improved and are respectively improved by about 8 GPa and 111 MPa.
本发明属于复相陶瓷材料技术领域，具体涉及一种高强度碳化硅（SiC）复相陶瓷及其制备方法。本发明采用热压烧结和放电等离子体烧结两种烧结方式，以氧化钇（Y2O3）为烧结助剂，以氮化铝（A1N）、二硼化钛（TiB2）、碳化钒(VC)为增强相，制备SiC复相（SiC‑AlN‑VC‑TiB2）陶瓷。本发明所得SiC复相陶瓷的主相为六方SiC和A1N的固溶体，而TiB2和VC以第二相形式存在。SiC复相陶瓷中各物相的结晶程度非常好，SiC复相陶瓷的致密度、硬度、弯曲强度很高，具有良好的耐磨性能。在热压烧结中，致密度由91.8%提升至99.2%；陶瓷硬度提高约4 GPa，弯曲强度提高了约84 MPa，体积磨损率仅为2.43×10‑5 mm3/Nm。本发明在SPS烧结中，复相陶瓷的致密度提高约3%；引入烧结助剂后复相陶瓷硬度和弯曲强度有很大提升，分别提高了约8 GPa和111 MPa。
High-strength SiC composite ceramic and preparation method thereof
The invention belongs to the technical field of multiphase ceramic materials, and particularly relates to high-strength silicon carbide (SiC) multiphase ceramic and a preparation method thereof. According to the preparation method, two sintering modes of hot pressing sintering and discharge plasma sintering are adopted, yttrium oxide (Y2O3) is taken as a sintering aid, and aluminum nitride (A1N), titanium diboride (TiB2) and vanadium carbide (VC) are taken as reinforcing phases, so that the SiC complex-phase (SiC-AlN-VC-TiB2) ceramic is prepared. The main phase of the SiC composite ceramic is a solid solution of hexagonal SiC and A1N, and TiB2 and VC exist in the form of a second phase. The crystalline degree of each phase in the SiC composite ceramic is very good, the density, hardness and bending strength of the SiC composite ceramic are very high, and the SiC composite ceramic has good wear resistance. In the hot pressing sintering process, the density is increased to 99.2% from 91.8%; the ceramic hardness is improved by about 4 GPa, the bending strength is improved by about 84 MPa, and the volume wear rate is only 2.43 * 10 <-5 > mm < 3 >/Nm. In the SPS sintering process, the density of the composite ceramic is improved by about 3%; after the sintering aid is introduced, the hardness and bending strength of the composite ceramic are greatly improved and are respectively improved by about 8 GPa and 111 MPa.
本发明属于复相陶瓷材料技术领域，具体涉及一种高强度碳化硅（SiC）复相陶瓷及其制备方法。本发明采用热压烧结和放电等离子体烧结两种烧结方式，以氧化钇（Y2O3）为烧结助剂，以氮化铝（A1N）、二硼化钛（TiB2）、碳化钒(VC)为增强相，制备SiC复相（SiC‑AlN‑VC‑TiB2）陶瓷。本发明所得SiC复相陶瓷的主相为六方SiC和A1N的固溶体，而TiB2和VC以第二相形式存在。SiC复相陶瓷中各物相的结晶程度非常好，SiC复相陶瓷的致密度、硬度、弯曲强度很高，具有良好的耐磨性能。在热压烧结中，致密度由91.8%提升至99.2%；陶瓷硬度提高约4 GPa，弯曲强度提高了约84 MPa，体积磨损率仅为2.43×10‑5 mm3/Nm。本发明在SPS烧结中，复相陶瓷的致密度提高约3%；引入烧结助剂后复相陶瓷硬度和弯曲强度有很大提升，分别提高了约8 GPa和111 MPa。
High-strength SiC composite ceramic and preparation method thereof
一种高强度SiC复相陶瓷及其制备方法
HAI WANXIU (author) / GONG MAOYUAN (author) / ZHANG SHUBO (author) / ZHANG HAI (author) / CHEN YUHONG (author) / LIU MEILING (author) / LU YOUJUN (author)
2023-08-22
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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