中文摘要：

以二硼化锆（ZrB2）为硬夹层,氮化硼纳米管（BNNTs）为基体B4C层补强增韧剂,聚乙烯醇缩丁醛（PVB）为粘结剂,邻苯二甲酸二辛酯（DOP）为增塑剂,采用非水基流延成型工艺制备ZrB2流延膜。研究了PVB含量、DOP含量以及固相含量对ZrB2流延浆料流变性能的影响。实验结果表明：当PVB和DOP的加入量分别为5 wt%和6 wt%时可获得固含量为50 wt%的均匀稳定ZrB2流延浆料,采用流延成型制备出不同厚度的ZrB2流延膜。与本实验室已制备的B4C-BNNTS流延膜进行叠层、热压烧结制备出ZrB2/B4C-BNNTs层状复合材料。实验结果表明,当基体层与硬夹层的层厚比为2∶1时,在2000℃、压力30 MPa下热压烧结得到的ZrB2/B4C-BNNTs层状复合材料的力学性能最佳,其维氏硬度和断裂韧性分别为39.6 GPa、7.69 MPa·m1/2。

英文摘要：

ZrB2 casting tapes were prepared by non-aqueous tape casting using ZrB2 as hard layer, BNNTs as toughening phase of B4C base layer, PVB as binder and DOP as plasticizer. The influences of PVB content, DOP content and solid content on the rheological properties of slurries were studied. The results indicated that the ZrB2 slurry with 50 wt% solid content could be obtained when the content of PVB and DOP was 5 wt%, 6 wt% respectively. ZrB2 tapes with different thickness were prepared by this method. ZrB2/B4C-BNNTs were prepared by laminating the ZrB2 tapes with the pre-prepared B4C-BNNTs tapes and hot pressing process. The results showed when the ratio of base layer and hard layer was 2, the best mechanical properties of ZrB2/B4C-BNNTs laminated composites were achieved under 2000 ℃ sintering temperature and 30 MPa pressure. The vickers hardness and fracture toughness was 39.6 GPa and 7.69 MPa·m1/2, respectively.