纳米ZrB2粉体放电等离子烧结制备ZrB2基超高温陶瓷  

Fabrication of ZrB-based Ultra-high Temperature Ceramics by SPS Using Nanosized ZrB Powders

作　　者：桂凯旋 张庆达 朱冬冬[2] 王刚[1] Gui Kaixuan;Zhang Qingda;Zhu Dongdong;Wang Gang(Anhui Polytechnic University,Wuhu 241000,China;Key Laboratory of Air-Driven Equipment Technology of Zhejiang Province,Quzhou University,Quzhou 324000,China)

机构地区：[1]安徽工程大学,安徽芜湖241000 [2]衢州学院浙江省空气动力装备技术重点实验室,浙江衢州324000

出　　处：《稀有金属材料与工程》2020年第7期2213-2219,共7页Rare Metal Materials and Engineering

基　　金：Pre-research Project of National Natural Science Foundation of Anhui Polytechnic University(2019yyzr05);University Synergy Innovation Program of Anhui Province(GXXT-2019-015);National Natural Science Foundation of China(51704001)。

摘　　要：采用纳米ZrB2粉体研究了ZrB2基超高温陶瓷的放电等离子烧结行为。由于采用纳米粉体,单相ZrB2在1550℃的低温下即发生快速的致密化烧结。ZrB2-Si C陶瓷经1800℃放电等离子烧结后可实现完全致密化,并且材料的抗弯曲强度高达1078±162MPa。在1700℃采用放电等离子烧结成功制备了ZrB2-Si C-Cf复合材料,材料断口表现出明显的纤维拔出现象,导致其具有高的断裂韧性值(6.04 MPa·m^1/2)和非脆性断裂的模式。同时,ZrB2-Si C-Cf复合材料具有很高的临界热冲击温差(627℃),表明该材料具有优异的抗热冲击性能。The spark plasma sintering behaviors of ZrB2-based ultra-high temperature ceramics were investigated using nanosized ZrB2 powders.Results show that rapid densification occurs at low temperature(1550℃)for monolithic ZrB2 due to the nanosized powders.ZrB2-SiC ceramics were fully densified by SPS at 1800℃,thus obtaining a high flexural strength of 1078±162 MPa.ZrB2-SiC-Cf composites are prepared by SPS at 1700℃.The composites show obvious fiber pull-out on the fracture surface,leading to a high fracture toughness(6.04 MPa·m^1/2)and a non-brittle fracture mode.Meanwhile,a high critical thermal shock temperature difference of 627℃is obtained for ZrB2-SiC-Cf,implying excellent thermal shock resistance of such material.

关 键 词：硼化锆 超高温陶瓷 放电等离子烧结 碳纤维 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TQ174.758.1[化学工程—陶瓷工业]