In this work, h-BN based composites containing amorphous silica and ytterbium silicate glass phases were successfully fabricated by in situ hot pressing process. The powder mixtures of h-BN, Yb₂O₃, SiO₂ and sintering additive (Al₂O₃) were hot pressed at 1880 °C for 1 h under 30 MPa in Ar atmosphere. In the composites, β-Yb₂Si₂O₇ phase produced from the reaction between Yb₂O₃ and SiO₂ disappears completely and transforms to Yb-Si-Al-O glass when the amount of Al₂O₃ is ≥1.5 wt.%. The Vickers hardness, flexural strength, and compressive strength reached the maximum values of 2.38 ± 0.08 GPa, 337 ± 22 MPa and 950 ± 34 MPa, respectively, as 1.5 wt.% Al₂O₃ was added. The strengthening effects were attributed to the fine spherical microstructure of Yb-Si-Al-O glass particles, strong [AlO₄] coordination state, and residual compressive stress in glass phases.

在这项工作中，通过原位热压工艺成功地制备了包含非晶态二氧化硅和硅酸玻璃相的h- BN基复合材料。将h -BN，Yb ₂ O ₃，SiO ₂和烧结添加剂（Al ₂ O ₃）的粉末混合物在Ar气氛中在30 MPa下于1880°C进行热压1 h。在复合材料中，β-镱₂的Si ₂ ö ₇从镱之间的反应产生的相₂ ö ₃和SiO _2个完全消失和变换以镱硅铝-O玻璃时Al量₂ø ₃是≥1.5重量％。当添加1.5重量％的Al ₂ O ₃时，维氏硬度，弯曲强度和抗压强度分别达到2.38±0.08GPa，337±22MPa和950±34MPa的最大值。强化效果归因于Yb-Si-Al-O玻璃颗粒的精细球形微结构，强[AlO ₄ ]配位态和玻璃相中的残余压应力。