无机材料学报2024，Vol.39Issue(8)：955-964,10.DOI:10.15541/jim20240035
流延成型结合反应熔渗制备ZrB2-SiC陶瓷及其微观结构与氧化行为研究
Microstructure and Oxidation Behavior of ZrB2-SiC Ceramics Fabricated by Tape Casting and Reactive Melt Infiltration
摘要
Abstract
ZrB2-based ceramics typically necessitate high temperature and pressure for sintering,whereas ZrB2-SiC ceramics can be fabricated at 1500℃using the process of reactive melt infiltration with Si.In comparison to the conventional preparation method,reactive synthesis allows for the more facile production of ultra-high temperature ceramics with fine particle size and homogeneous composition.In this work,ZrSi2,B4C,and C were used as raw materials to prepare ZrB2-SiC via combination of tape casting and reactive melt infiltration herein referred to as ZBC ceramics.Control sample of ZrB2-SiC was also prepared using ZrB2 and SiC as raw materials through an identical process designated as ZS ceramics.Microscopic analysis of both ceramic groups revealed smaller and more uniformly distributed particles of the ZrB2 phase in ZBC ceramics compared to the larger particles in ZS ceramics.Both sets of ceramics underwent cyclic oxidation testing in the air at 1600℃for a cumulative duration of 5 cycles,each cycle lasting 2 h.Analysis of the oxidation behavior showed that both ZBC ceramics and ZS ceramics developed a glassy SiO2-ZrO2 oxide layer on their surfaces during the oxidation.This layer severed as a barrier against oxygen.In ZBC ceramics,ZrO2 is finely distributed in SiO2,whereas in ZS ceramics,larger ZrO2 particles coexist with glassy SiO2.The surface oxide layer of ZBC ceramics maintains a dense structure because the well-dispersed ZrO2 increases the viscosity of glassy SiO2,preventing its crystallization during the cooling.Conversely,some SiO2 in the oxide layer of ZS ceramics may crystallize and form a eutectic with ZrO2,leading to the formation of ZrSiO4.This leads to cracking of the oxide layer due to differences in thermal expansion coefficients,weakening its barrier effect.An analysis of the oxidation resistance shows that ZBC ceramics exhibit less increase in oxide layer thickness and mass compared to ZS ceramics,suggesting superior oxidation resistance of ZBC ceramics.关键词
超高温陶瓷/ZrB2-SiC/氧化行为/反应熔渗Key words
ultra-high temperature ceramic/ZrB2-SiC/oxidation behavior/reactive melt infiltration分类
化学化工引用本文复制引用
谭敏,陈小武,杨金山,张翔宇,阚艳梅,周海军,薛玉冬,董绍明..流延成型结合反应熔渗制备ZrB2-SiC陶瓷及其微观结构与氧化行为研究[J].无机材料学报,2024,39(8):955-964,10.基金项目
National Key R&D Program of China(2022YFB3707700) （2022YFB3707700）
Shanghai Science and Technology Innovation Action Plan(21511104800) （21511104800）
National Natural Science Foundation of China(52172111) （52172111）
National Science and Technology Major Project(2017-IV-0005-0042) （2017-IV-0005-0042）
Key Research Program of the Chinese Academy of Sciences(ZDRW-CN-2021-2-2) （ZDRW-CN-2021-2-2）
Science Center for Gas Turbine Project(P2022-B-IV-001-001) （P2022-B-IV-001-001）
