材料期刊网

Influences of Casting Pressure Conditions on the Quality and Properties of a Magnesium Cylinder Head Cover Die Casting

Wenhui LIU , Yangai LIU , Shoumei XIONG , Baicheng LIU , Y.Matsumoto , M.Murakami

材料科学技术（英文）

Casting pressure conditions have great influences on the casting defects, such as gas porosity, shrinkage porosity and gas holes. A Mg cylinder head cover die casting was used to experimentally study the influences of casting pressure, the loading time and the piston position of pressure intensification on the variation of pressure and the quality of casting. The results show that casting pressure, the loading time and the piston position of pressure intensification have great influences on the pressure variations in the mold, the quality and performance of casting. The external quality, the density and the tensile strength of casting were improved with the increase of casting pressure and the piston position of pressure intensification and the decrease of the loading time of pressure intensification.

关键词: Magnesium alloy , null , null , null , null

压力下的炭化

新型炭材料 doi:10.1016/S1872-5805(09)60042-1

述评了三类压力下的炭化途径:分解气体自升压状态下的炭化,水热反应和还原CO2成炭.尽管这些在加压状态下形成的不同形态和纳米织构的炭材料具有相当高的收率,然而在很多情况下它们是多种形态炭材料的混合物.述评着眼于温度-压力条件和所用的前驱体的化学组成,讨论了高纯度、分离态的炭球的形成条件.

关键词: 炭化 , 压力 , 炭球

压力渗透对长效防腐涂层耐蚀性能的影响研究

曹京宜 , 张寒露 , 孟宪林 , 张锋

涂料工业 doi:10.3969/j.issn.0253-4312.2010.01.002

设计了压力模拟试验装置,通过模拟不同压力渗透状态,评价涂层耐海水压力渗透的性能及涂层在压力状态下的失效机理.

关键词: 压力 , 耐腐蚀涂层 , 失效机理