粉末冶金材料科学与工程
粉末冶金材料科學與工程
분말야금재료과학여공정
POWDER METALLURGY MATERIALS SCIENCE AND ENGINEERING
2014年
2期
320-327
,共8页
碳纳米管%氧化锆陶瓷%杂凝聚%断裂韧性%电导率%介电常数
碳納米管%氧化鋯陶瓷%雜凝聚%斷裂韌性%電導率%介電常數
탄납미관%양화고도자%잡응취%단렬인성%전도솔%개전상수
CNTs%3Y-ZrO2%fractured toughness%electrical conductivity%dielectric constant
采用杂凝聚的方式制备CNTs (CNTs为碳纳米管Carbon nanotubes)分散均匀的3Y-ZrO2/CNTs混合粉体，热压后得到3Y-ZrO2/CNTs复合陶瓷块体材料。与普通球磨混料法制备的陶瓷样品进行对比，研究CNTs含量以及CNTs的分散性对3Y-ZrO2/CNTs复合陶瓷的组织、密度、断裂韧性以及电学性能的影响，并分析CNTs对陶瓷的增韧机理。结果表明，采用杂凝聚处理有助于CNTs在3Y-ZrO2/CNTs复合陶瓷中的均匀分散，CNTs含量(质量分数，下同)为1.00%的3Y-ZrO2/CNTs复合陶瓷的断裂韧性达到(18.13±0.50) MPa·m1/2，较球磨混料法制备的样品提高35.10%。陶瓷基体中均匀分散的CNTs不仅通过促进马氏体相变起到增韧作用，而且CNTs的桥联和拔出机制也直接起到增韧的作用。CNTs 在陶瓷基体中均匀分散能大幅降低复合陶瓷的导通阈值。经杂凝聚预处理的CNTs含量为4.00%时，3Y-ZrO2/CNTs复合陶瓷的电导率达到4.467 S/m，比不含CNTs的3Y-ZrO2陶瓷高13个数量级；当CNTs含量为1.00%时，复合材料的相对介电常数达到6340，比未经杂凝处理的样品高2个数量级。
採用雜凝聚的方式製備CNTs (CNTs為碳納米管Carbon nanotubes)分散均勻的3Y-ZrO2/CNTs混閤粉體，熱壓後得到3Y-ZrO2/CNTs複閤陶瓷塊體材料。與普通毬磨混料法製備的陶瓷樣品進行對比，研究CNTs含量以及CNTs的分散性對3Y-ZrO2/CNTs複閤陶瓷的組織、密度、斷裂韌性以及電學性能的影響，併分析CNTs對陶瓷的增韌機理。結果錶明，採用雜凝聚處理有助于CNTs在3Y-ZrO2/CNTs複閤陶瓷中的均勻分散，CNTs含量(質量分數，下同)為1.00%的3Y-ZrO2/CNTs複閤陶瓷的斷裂韌性達到(18.13±0.50) MPa·m1/2，較毬磨混料法製備的樣品提高35.10%。陶瓷基體中均勻分散的CNTs不僅通過促進馬氏體相變起到增韌作用，而且CNTs的橋聯和拔齣機製也直接起到增韌的作用。CNTs 在陶瓷基體中均勻分散能大幅降低複閤陶瓷的導通閾值。經雜凝聚預處理的CNTs含量為4.00%時，3Y-ZrO2/CNTs複閤陶瓷的電導率達到4.467 S/m，比不含CNTs的3Y-ZrO2陶瓷高13箇數量級；噹CNTs含量為1.00%時，複閤材料的相對介電常數達到6340，比未經雜凝處理的樣品高2箇數量級。
채용잡응취적방식제비CNTs (CNTs위탄납미관Carbon nanotubes)분산균균적3Y-ZrO2/CNTs혼합분체，열압후득도3Y-ZrO2/CNTs복합도자괴체재료。여보통구마혼료법제비적도자양품진행대비，연구CNTs함량이급CNTs적분산성대3Y-ZrO2/CNTs복합도자적조직、밀도、단렬인성이급전학성능적영향，병분석CNTs대도자적증인궤리。결과표명，채용잡응취처리유조우CNTs재3Y-ZrO2/CNTs복합도자중적균균분산，CNTs함량(질량분수，하동)위1.00%적3Y-ZrO2/CNTs복합도자적단렬인성체도(18.13±0.50) MPa·m1/2，교구마혼료법제비적양품제고35.10%。도자기체중균균분산적CNTs불부통과촉진마씨체상변기도증인작용，이차CNTs적교련화발출궤제야직접기도증인적작용。CNTs 재도자기체중균균분산능대폭강저복합도자적도통역치。경잡응취예처리적CNTs함량위4.00%시，3Y-ZrO2/CNTs복합도자적전도솔체도4.467 S/m，비불함CNTs적3Y-ZrO2도자고13개수량급；당CNTs함량위1.00%시，복합재료적상대개전상수체도6340，비미경잡응처리적양품고2개수량급。
The key to toughen 3Y-ZrO2 ceramics with CNTs lies in its dispersion condition in the matrix. In the present article, the heterocoagulation method aided by the ultrasonic dispersing and spray drying techniques were used to pretreat the mixture of CNTs and ZrO2 powder, and hot-pressing was employed subsequently to fabricate the solid composite ceramics. The experiment results indicate that the heterocoagulation method is much helpful to the uniform dispersion of CNTs in the ZrO2 matrix. The composite with content of 1.00wt% CNTs can be toughened as high as (18.13±0.50) MPa·M1/2 after hot-pressing (1 400℃/2 h/50 MPa), or 35.10%increase in relative value compared with that of the blank one. The uniformly dispersed CNTs can be toughened not only by promoting the martensitic transformation, but also by the bridge and pull-out effects as well. The electric properties results also show that good dispersion of CNTs in matrix can greatly reduce the turn-on threshold. As CNTs have been heterocoagulated, the electrical conductivity of 3Y-ZrO2/CNTs composite ceramics with 4.00wt% CNTs can be as high as 4.467 S/m, which is 13 order of magnitude higher than that of the blank one;and the relative dielectric constant with 1.00wt%CNTs can be as high as 6 340, which is 2 order of magnitude higher than that of the composite in which CNTs is not heterocoagulaed.
