(1. 東北大學(xué) 材料與冶金學(xué)院，沈陽(yáng) 110006；
2. 遼寧工學(xué)院 材料工程系，錦州 121001)
摘 要: 以Al，Ti，F(xiàn)e等為主要原料，采用SHS法研制了Ti-Al基微孔過(guò)濾材料；研究了原材料和生成相對(duì)材料的孔隙率、透氣系數(shù)、孔隙形狀及大小的影響；分析了熱爆與成孔機(jī)理并根據(jù)馬爾科夫狀態(tài)轉(zhuǎn)移原理建立了熱爆反應(yīng)模型。結(jié)果表明：材料的孔隙率、透氣系數(shù)隨原料Fe含量的增加而提高，當(dāng)Fe含量為50%時(shí)，材料的孔隙率為54%，透氣系數(shù)為6864.2Pa·min-1；孔隙的形狀和大小取決于原料Al和生成物FeAl的分布和大小；熱爆過(guò)程是先Fe-Al熱爆，然后引爆Ti-Al；孔隙是由于低熔點(diǎn)的Al和FeAl在熱爆過(guò)程中的熔化、沖刷而形成的；利用馬爾科夫狀態(tài)轉(zhuǎn)移原理可以建立熱爆反應(yīng)模型，進(jìn)而可以預(yù)測(cè)熱爆反應(yīng)的起始時(shí)間。
關(guān)鍵字: SHS；Ti-Al；微孔材料；馬爾科夫狀態(tài)轉(zhuǎn)移原理；熱爆反應(yīng)模型
porous material
（1. School of Materials and Metallurgy,
Northeastern University, Shenyang 110006, China；
2. Department of Materials Engineering,
Liaoning Institute of Technology, Jinzhou 121001, China）
Abstract:Ti-Al based porous material was investigated through SHS process of Al, Ti, Fe. The influences of raw materials and phases on the porosity, gas per me ability, pore size and shape were studied. The mechanism of thermal explosion an d pore formation was analyzed. The thermal explosion model was established on the bas is of Markov. The results show that the porosity and gas permeability of material are enhanced with the rise of the Fe content, at 50%Fe, porosity is 54%, gas permeability 6864.2Pa·min-1; the shape and size of pore is related to the distribution and size of Al and FeAl; the thermal explosion is achieved by Fe-Al thermal explosion, inducing Ti-Al thermal explosion; the formation of pore is accomplished with melting, scouring of Al and FeAl; the thermal explosion model can be established on the basis of Markov, and by means of it, the time of thermal explosion can be predicted.
Key words: SHS；Ti-Al；porous material；Markov；model of thermal explosion
