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SYNTHESIS OF TiN BY MICROWAVE CARBOTHERMAL REDUCTION OF TiO_2

B.H Liu , Y Zhang , S.X. Ouyang , and H.C. Gu (Research Institute of Technical Chemical Physics , East China University of Science and Technology , Shanghai 200237 , China)(Department of Materials Physics , University of Science and Technology Beijing , Beijing 100083 , China)(State Key Laboratory for Synthesis and Processing of Advanced Materials , Wuhan University of Technology , Wuhan 430070 , China)

金属学报(英文版)

Titanium nitride powder was synthesized by microwave carbothermal reduction of titanium oxide. The mechanism and thermal dynamics of the reaction process were studied. The results show that the microwave carbothermal reduction technology has unique advantages over the conventional reduction methods. It can not only lower the reaction temperature, shorten the synthesis cycle, but also refine the product particles,as well as improving the reactivity of the powder.

关键词: TiN microwave , null

NVESTIGATION OF PRODUCTOPN OF FUNCTIONALLY GRADIENT MATERIAL BY ELECTROLESS PLATING

Z.M.Xu1) , J.S.Zhen1) , H.F.Liu1) and L.M.Zhang2) 1)Departent of Chemistry , Huazhong University of Science and Technology , Wuhan 430074 , China 2)Institute of Materials Science and Engineering , Wuhan University of Technology , Wuhan 430070 , China

金属学报(英文版)

Thispaper proposed a new methodof producing Ceramic/ Metalfunctionally gradient mate rialby electroless platingtechnique. The experimentof producing SiC/ Ni PFGM wascar ried out with self made electroless plating facilities. The results show that the thickness of FGMcoating andthegradientdistribution ofcompositioncanbecontrolled byoptimizingelec trolessplating technology and changing the parameters such as plating time, the additionspeed and concentration of SiCparticles. Analysisdemonstratesthatthereisastrongrelation ship amongthe SiCcontent,the microstructureandthe mechanicalproperty ofthe FGM.

关键词: electrolessplating , null , null

Preparation and Gas-sensing Characteristics of Na~+-doped ZnO Single Crystals

Suying PAN and Junbiao MAO (Center for Materials Research and Analysis , Wuhan University of Technology , Wuhan , 430070 , China)(To whom correspondence should be addressed)

材料科学技术（英）

ZnO single crystals were grown by vapor phase reaction of Zno powder with active carbon powdei at an elevated temperature The typical crystals were colorless and transparent with maximum size o4 0.1 mm in diameter and 25 mm in length, The gas-sensing characteristics of Na+-doped anc undoped single crystals were investigated in 1 %H2. Co and CH, in air between 1 50 and 600℃. It was found that the undoped ZnO single crystals showed little gas sensitivity in air. and Na+-doping can greatly enhance the senstivity by increasing the resistivities. The maximum sensitivity of the samples is 22 (Ra/ Rg) for H2. 1 2 for CO and 4 for CH4

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