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
Dianran YAN
,
Jining HE
,
XiangZhi LI
,
Yangai LIU
,
Yu ZHOU
,
Dechang JIA
材料科学技术（英文）
The corrosion resistance of SiO2/A12O3, TiO2/Al2O3 and (SiO2+TiO2)/Al2O3 ceramic composite coatings on Q235 substrate fabricated by means of plasma spraying was investigated. The results show that A12O3+13 wt pct TiO2 ceramic coating has the highest density, the lowest connected porosity and the best corrosion resistance. The corrosion mechanism of Q235 with ceramic coating has also been studied.
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