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Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering
Journal of Advanced Ceramics ( IF 18.6 ) Pub Date : 2021-03-24 , DOI: 10.1007/s40145-020-0451-0
Baofu Qiu , Xiaoming Duan , Zhuo Zhang , Chen Zhao , Bo Niu , Peigang He , Delong Cai , Lei Chen , Zhihua Yang , Yujin Wang , Dechang Jia , Yu Zhou

BN/La-Al-Si-O composite ceramics were fabricated by hot-pressed sintering using hexagonal boron nitride (h-BN), lanthanum oxide (La2O3), aluminia (Al2O3), and amorphous silica (SiO2) as the raw materials. The effects of sintering temperature on microstructural evolution, bulk density, apparent porosity, and mechanical properties of the h-BN composite ceramics were investigated. The results indicated that La-Al-Si-O liquid phase was formed during sintering process, which provided an environment for the growth of h-BN grains. With increasing sintering temperature, the cristobalite phase precipitation and h-BN grain growth occurred at the same time, which had a significant influence on the densification and mechanical properties of h-BN composite ceramics. The best mechanical properties of BN/La-Al-Si-O composite ceramics were obtained under the sintering temperature of 1700 °C. The elastic modulus, flexural strength, and fracture toughness were 80.5 GPa, 266.4 MPa, and 3.25 MPa·m1/2, respectively.



中文翻译:

La-Al-Si-O玻璃相的h-BN基复合陶瓷在热压烧结过程中的组织演变

BN / La-Al-Si-O复合陶瓷是通过六方氮化硼(h-BN),氧化镧(La 2 O 3),氧化铝(Al 2 O 3)和无定形二氧化硅(SiO)进行热压烧结制成的2个)作为原料。研究了烧结温度对h-BN复合陶瓷显微组织演变,堆积密度,表观孔隙率和力学性能的影响。结果表明,在烧结过程中形成了La-Al-Si-O液相,为h-BN晶粒的生长提供了环境。随着烧结温度的升高,方石英相的析出和h-BN晶粒的生长同时发生,这对h-BN复合陶瓷的致密化和力学性能产生了重要影响。在1700°C的烧结温度下获得了BN / La-Al-Si-O复合陶瓷的最佳机械性能。弹性模量,弯曲强度和断裂韧性分别为80.5 GPa,266.4 MPa和3.25 MPa·m 1/2, 分别。

更新日期:2021-03-24
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