The SiCp/AZ91D composites were fabricated with high joining ratio, uniform distribution and low pore ratio by adjusting the joining means of SiCp and the parameters of process for the localization of recent stirring-casting technologies.

FeS solid lubrication layer was prepared on the ion nitrocarburized surface of CrMoCu alloy cast iron by means of low temperature ion sulphurizing.

Analyzed the coal gas drum breeze machine a measure for hanging ashen reason, passing by experimenting finding out understanding definitely, then pass a leafs round sprays to draw the layer, realizes to prevent the ashen to pile up on leafs round.