【摘 要】
：
The effect of heating rates during vacuum debinding on the microstructure and mechanical properties of alumina ceramics are discussed in this paper.The three-di
【机 构】
：
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnica
论文部分内容阅读
The effect of heating rates during vacuum debinding on the microstructure and mechanical properties of alumina ceramics are discussed in this paper.The three-dimensional (3D)-printed alumina ceramics examined in this study were found to have a layered structure,and interlayer spacing increased as the heating rate increased.The pore diameter,shrinkage,flexural strength and hardness were found to decrease as the heating rate increased due to weak interfacial bonding between alumina particles.Shrinkage was found to be much larger along the Z direction than along the X or Y directions due to the layer-bylayer forming mode during 3D printing.0.5 ℃·min-1 is considered the optimum heating rate,yielding ceramics with interlayer spacing of 0.65 μm,shrinkage of 2.6％,2.3％ and 4.0％ along the X,Y and Z directions,respectively,flexural strength of 27.5 MPa,hardness of 29.8 GPa,Vickers hardness of HV 266.5,pore diameter of 356.8 nm,bulk density of 2.5 g·cm-3,and open porosity of 38.4％.The debinding procedure used in this study could be used to produce a high-quality ceramic which can be used for fabricating alumina ceramic cores.
其他文献
Geopolymers,such as phosphate-based geopolymer,are promising materials that have drawn extensive attentions as wave-transparent candidates with low dielectric l
It is our great pleasure as Guest Editors of the journal “Rare Metals” to present the special issue on “Advanced Structural Ceramics Technology & Characteris
为了实现多接口车载自组织网络(VANET)车辆节点合理高效的信道接入,提出了一种基于车辆节点多接口状态字的时分竞争信道接入算法。根据车辆节点的多接口状态字给出了时隙划分
The coatings were produced on Ti6Al4V by lasercladding the mixture of Ni-based alloy and different contents of TaC (0 wt％,5 wt％,10 wt％,20 wt％,30 wt％,40 wt％).The micro
Graphene nanoplatelets (GNPs) are considered to be one of the most promising new reinforcements due to their unique two-dimensional structure and remarkable mec
In this work,a two-step zircon method to produce zirconium oxychloride was introduced,and the alkali fusion technique with NaOH and water leaching process were
The microstructure and hot tensile behaviors of the different heat-treated Ti2AlNb sheets were investigated by backscattered electron image (BSE),electron backs
As a kind of important light alloys,the Al alloys exhibit mechanical properties that are closely related to the microstructures.Changing the main alloying eleme
High-thermal-conductivity silicon nitride ceramic substrates are indispensable components for nextgeneration high-power electronic devices because of their exce
为纪念我国具有完全自主知识产权的第三代战斗机——歼-10飞机研制成功,中国人民银行于2007年5月29日发行了“中国歼-10飞机金银纪念币”一套。
In commemoration of our co