摘要:In this paper, the influence factors upon the dimension precision and the finish of ceramic mold are researched. Based on this test, the optimum parameters are selected Two new kinds organic catalyzers and a new technique called dipping stable liquid- treatment are successfully developed, hence the precision of the ceramic mold are able to be improved,As a result, the roughness of the precision casting die producedjs up to grade
摘要:Having studied the solidification behaviour on the thin-section aad complicated aluminium alloy precision casting with the plaster mold under the condition of the counter-pressure casting, using the experiment method of meas uring temperatures and the essencial principles on the heat transfer and the solidification, the present study obtained some basic laws of the solidification, such as the interfacial heat transfer, the temperature distributes, the mode and the order of freezing and their effects to the quality of the casting.
摘要:In this paper, an investigation of the relationship among the composi tions, properties and microstructures in Al-Cu cast alloys was described. It. was found that the transition metals such as manganese and zirconium provided an outstanding function to both the improvement on thermal stability and the increase in heterogeneity of the matrix structures. The rare-earth elements should be considered as the strengthening effect on the grain boundries by forming netty or skeletonal stable intermetallic compounds.
摘要:Thermal analysis can be used to monitor the modification effect of eutectic Al-Si casting alloy with Na or Sr, as well as to monitor a-grain refinement of hypoecutectic aluminium alloy and tomonitor primary silicon grain refinement of hypereutectic aluminium-silicon alloys. The microstructure and the mechanical properties of alloys can be determined by measuring AT at special temperature point and therefore this method is a quick, simple, convenient and economical method for monitoring the quality of melting Al-Si casting alloys.
摘要:In this paper, the influence of the melting and casting conditions on the toughness of ZA27 alloy has been studied. The results showed that the strict Sequence-solidification such as the horizontal continuous casting is the main condition of obtaining high plasticity, high toughness and high wearability. Wherease the grain refinement is not the ample condition.