Li Hucheng Li Lijun Yang long Liu Jiadong Fang Xinhui
Issue 4, Pages: 1-5(1993)
摘要:This paper deals with the effects of load and sliding speed to the wearing properties of ZA27 and ZCuSn6Zn6Pb3 alloys. The result shows that the substitution of ZA27 for ZCuSn6Zn6Pb3 is reasonable when the nominal contact stress and the value of PV are respectively higher than 7. 94MPa and 90 N m/s.
摘要:A conception of "frequency factor" is suggested for improving the accuracy to forecast the shrinkage defects. It shows that an sssociate use of the frequency factor and the criterion G/R could remarkably enhance the reliability and accuracy of forecasting. The numerical value of the criterion is related to the temperature range of solidification of the alloy.
摘要:The eutectic and primary silicon in hypereutectic Al-Si alloy can be refined by special modification. Then, the nodular silicon hypereutectic Al-Si alloy can be obtained through T6 treatment due to the crystallography flaky-nodular silicon transition. The average aspect ratio of nodular silicon is about 1. 6. In this alloy 99% of the silicon particles have their diameters less than 30 um, and less than 1 % of them have their diameters ranged from 3040um. The nodular silicon Al-22Si is characterized with better plasticity and with an ultimate tensile strength at room timperature up to 300 MPa and a tensile strength at 573K up to 100MPa, being better than those in commercial Al-22Si piston alloy. By way of contrast with commercial hypereutectic of Al-Si alloy the machinability Al-Si alloy tested was improved greatly.
摘要:The method using water soluble ceramic core for alluminum alloy plycast castings is presented. The anti-water technologies of the water soluble core and the low temperature baking process of the mold and the core are investigated. Experiments are taken and the results sre satifying.