Microstructures and mechanical properties of SiBCNAl ceramics produced by mechanical alloying and subsequent hot pressing
Microstructures and mechanical properties of SiBCNAl ceramics produced by mechanical alloying and subsequent hot pressing
复制标题
机械合金化及后续热压生产的 SiBCNAl 陶瓷的微观结构和机械性能
DOI：
10.1631/jzus.a1000161
复制
发表时间：
2010-10-01
影响因子：
3.2
通讯作者：
Zhang, Peng-fei
中科院分区：
文献类型：
--
作者：
Ye, Dan;Jia, De-chang;Zhang, Peng-fei
以结晶硅（Si）、六方氮化硼（h-BN）、石墨（C）和铝（Al）为原料，通过机械合金化（MA）技术制备了SiBCNAl非晶粉末。SiBCNAl粉末通过热压（HP）技术在1800 °C下在30 MPa的压力下在氩气和氮气中固结。烧结气氛对陶瓷的显微结构和力学性能有很大的影响。两种陶瓷具有不同的相组成和断口形貌。在氩气气氛中烧结的陶瓷的抗弯强度、断裂韧性、弹性模量和维氏硬度分别为421.90 MPa、3.40 MPa·m1/2、174.10 GPa和12.74 GPa。在氮气气氛中烧结的陶瓷，除维氏硬度外，力学性能均有所提高，分别为526.80 MPa、5.25 MPa·m1/2、222.10 GPa和11.63 GPa。
Amorphous SiBCNAl powders were prepared via a mechanical alloying (MA) technique using crystalline silicon (Si), hexagonal boron nitride (h-BN), graphite (C), and aluminum (Al) as starting materials. SiBCNAl powders were consolidated by a hot pressing (HP) technique at 1800 °C under a pressure of 30 MPa in argon and nitrogen. The sintering atmosphere had a great influence on the microstructures and mechanical properties of the ceramics. The two ceramics had different phase compositions and fracture surface morphologies. For the ceramics sintered in argon, flexural strength, fracture toughness, elastic modulus and Vickers hardness were 421.90 MPa, 3.40 MPa·m1/2, 174.10 GPa, and 12.74 GPa, respectively. For the ceramics sintered in nitrogen, the mechanical properties increased, except for the Vickers hardness, and the values of the above properties were 526.80 MPa, 5.25 MPa·m1/2, 222.10 GPa, and 11.63 GPa, respectively.