新锐洞察孔体积变化率-以泡沫钛为例（英文）  

New Insights into Change Rate of Pore Volume-Taking Titanium Foam for Example

作　　者：肖健[1] 刘锦平[1] 王智祥[1] 邱贵宝[2] Xiao Jian;Liu Jinping;Wang Zhixiang;Qiu Guibao(Jiangxi University of Science and Technology,Ganzhou 341000,China;Chongqing University,Chongqing 400044,China)

机构地区：[1]江西理工大学,江西赣州341000 [2]重庆大学,重庆400044

出　　处：《稀有金属材料与工程》2018年第11期3289-3294,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51761013,51674055);Jiangxi Provincial Education Department Program(GJJ160655);Doctoral Special Research Development Program of Jiangxi University of Science and Technology(jxxjbs16019)

摘　　要：基于粉末冶金的造孔剂法被广泛应用于制备泡沫金属尤其是泡沫钛。然而,如何获得所需孔隙率是这一技术面临的巨大挑战,因为孔隙率往往偏离期望值。作者前期研究的结果(即,P=ax+b。其中,a=1/(1+δ),b=δ/(1+δ))导致一个非常有趣的结论:孔体积变化率(δ)是一个不定数学常数。在研究基础上,通过建立数学模型发现了一个新的结果,即方程δ=φ-1。其中,长度指数积φ代表烧结泡沫的实际长度与设计值的比值乘积。这表明长度指数积(φ)是一个数值可测量的不定数学常数。因而,求出φ可算出a和b,泡沫钛的孔隙率(P)就可以通过基于造孔剂含量(x)的线性方程P=ax+b来预测。这意味着在不测量孔隙率的情况下,可以通过测量烧结泡沫金属的宏观尺寸变化来获得孔隙率的调控方程。该研究为粉末造孔剂法制备泡沫金属的结构调控提供了新思路和新方法。The space holder technique is widely used to fabricate metal foams,especially titanium foam.However,how to obtain the desired porosities is a big challenge for this technique,because they are not always equal to the expected ones.The results of the previous study(i.e.,P = ax + b,where a = 1/(1 + δ),b = δ/(1 + δ)) give a very interesting conclusion that is the change rate of pore volume(δ) is an indefinite mathematical constant.Based on the research work,we obtains a new result by establishing a mathematical model,which can be expressed as equation δ = φ-1.Here,φ is the length index product of the ratio between the actual length and the designed length of the sintered metal foam.It reveals that the length index product(φ) is also an indefinite mathematical constant and we can measure its value.Therefore,solving δ means both a and b are solved,so the porosity(P) of titanium foam can be predicted by the equation P = ax + b,depending on the spacer content(x).This indicates that in the absence of porosity measurements,the macroscopic dimensions of the sintered metal foam can be measured to obtain a controlling equation for porosity.

关 键 词：泡沫金属 钛合金 粉末冶金 造孔剂法 结构控制 

分 类 号：TF125.22[冶金工程—粉末冶金]