泡沫钛制备及力学性能评价研究  

Preparation of Titanium Foam and Mechanical Properties Evaluation

作　　者：王耀奇 王晓华 王哲磊 任学平[4] 侯红亮 Wang Yaoqi;Wang Xiaohua;Wang Zhelei;Ren Xueping;Hou Hongliang(AVIC Manufacturing Technology Institute,Beijing 100024,China;China 15th Metallurgical Construction Group Co.,Ltd,Wuhan 430075,China;Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China;University of Science and Technology of Bejing,Beijing 100083,China)

机构地区：[1]中国航空制造技术研究院,北京100024 [2]中国十五冶金建设集团有限公司,湖北武汉430075 [3]航天材料及工艺研究所,北京100076 [4]北京科技大学,北京100083

出　　处：《稀有金属材料与工程》2020年第3期1051-1057,共7页Rare Metal Materials and Engineering

基　　金：中航工业创新基金(2012E62523R)。

摘　　要：利用占位体烧结法在不同的占位体粒径、体积分数以及不同的烧结温度、时间条件下制备出泡沫钛。采用光学金相、扫描电镜等对泡沫钛的孔隙结构进行分析;通过室温压缩实验对泡沫钛的力学性能进行评价。结果表明,泡沫钛孔隙横截面呈圆形,纵截面呈椭圆形,其孔隙率与占位体体积分数的差值随占位体粒径、体积分数的增加、烧结温度的升高、时间的延长呈升高的变化趋势。同时,烧结温度越高,所制备的泡沫钛孔壁越致密。与传统的泡沫材料不同,泡沫钛应力-应变关系曲线并没有出现明显的应力平台,抗压缩强度和弹性模量随孔隙率的增加呈下降的变化趋势,当孔隙率为67.6%时,抗压缩强度和弹性模量分别达到14.4 MPa和1.17 GPa。抗压缩强度随孔径的增大呈先升高再降低的变化趋势,而弹性模量随孔径的增加基本不变,当孔径达到1.15~1.53 mm时,其抗压缩强度和弹性模量分别达到48.9 MPa和1.72 GPa。Titanium foam was prepared by space holder sintering process under different particle diameters,volume ratios and sintering temperatures and time.The pore structure of titanium foam was analyzed by optical metallography and scanning electron microscope.The mechanical properties of titanium foam were evaluated by compression test at room temperature.The results show that the pore of titanium foam is round on the cross-section and is elliptical on the longitudinal section.The difference between porosity of titanium foam and the volume ratio of space holder increase with the increase of the particle diameter,volume ratio,sintering temperature and time.At the same time,the higher the sintering temperature,the denser the pore wall of titanium foam.Unlike the traditional foam materials,there is no obvious stress platform in the relationship between the stress and strain of titanium foam.The compressive strength and elastic modulus decrease with the increase of porosity.When the porosity is 67.6%,the compressive strength and elastic modulus reach 14.4 MPa and 1.17 GPa,respectively.The compressive strength increases first and then decreases with the increase of pore diameter,while the elastic modulus remains unchanged.When the pore diameter reaches 1.15~1.53 mm,the compressive strength and elastic modulus reach 48.9 MPa and 1.72 GPa,respectively.

关 键 词：泡沫钛 占位体烧结法 孔隙结构 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]