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《Materials for Mechanical Engineering》 2009-03
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Effect of Preparation Technology on Thermal Stability of Cu Coated MoSi_2 Composite Particles

GUO Tie-ming~1,JI Gen-shun~1,MA Qin~1,ZHOU Qi~2,JIA Jian-gang~2 (1.State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials;2.Key Laboratory of Non-ferrous Metal Alloys,The Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)  
Cu coated MoSi_2 composite particles were prepared by heterogeneous nucleation method.X-ray diffraction(XRD) was used to determine the phases of the Cu coated MoSi_2 composite particles.Differential scanning catorometer(DSC) was used to characterize the thermophysical and thermochemical behaviors of the particles.The results indicate that no chemical reaction occurred between Cu and MoSi_2 in the range from room temperature to 1 000℃.There was Cu_2Cl(OH)_3 in the particles prepared in the HCl acid solution,and it decomposed to CuO and CuCl with vapor releasing at about 250℃.CuCl melted at about 420℃.CuO decomposed to Cu_2O and O_2 at about 800℃.The stability of the particals improved when they were prepared in the aqueous solution using alkylphenol ethoxylates as the modificatec,only decomposition reaction of CuO occurred in the range of room temperature to 1 000℃.The finer the particles of MoSi_2 were,the higher the nucleation rate was.And the finer the Cu grains were,and the higher the decomposition temperature of CuO formed from oxidation was.
【Fund】: 甘肃省自然基金资助项目(3ZS061-A25-038)
【CateGory Index】: TB383.1
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