Preparation of short nano-carbon fibers reinforced copper composites by laminated direct press-casting method;

This paper mainly bases on the research and development of piece type automobile oxygen sensor, and we has conducted more careful research to the aspects of silk-screen printing, thermo-compression folding craft, the sintering craft, the oxygen sensors porous layer preparation and oxygen sensor signal examination and so on.

This paper describes the preparation of strong composite gibbous hat through ana- lyzing of the difficulty selects epoxy-novolak resin as matrix,and glass cloth as reinforcement and succees in making strong heat-resistant composites by the wet lay-up hot compression moulding.

Based on the analysis of the necessary condition for OWT,using the cascade algorithm and 2D separable wavelet transform scheme,discrete approximation sequence of scaling and wavelet functions was computed for optical implementation.

High quality castings with porefree or less-pore can be obtained by means of the middle pressure casting with differential pressure compound technology with proper fill rate,thermal design and strengthening directional solidification of die temperature fields.