摘要:The linear shrinkage and shrinkage cavity rate of aluminum-richening zinc alloy is tested,and the stress is placed on the study of the underside shrinkage phenomenon of the alloy. The experimental results show that,under the condition of sand-cast, the critical mondule for occuring underside shrinkage is 1. 25 cm. The best method to eliminate underside shrinkage is to quicken the cooling rate of castings, and the underside shrinkage also can be eliminated with trace elements put into the alloys.
摘要:This work was undertaken to systematically investigate optimal RE,Mg and Cu ratios in ZL108 alloy. By the experimental design simplex method, while mischmetal was added into the melted alloy ,contents of magnesium and copper were regulated. Data obtained in tests were treated by microcomputer to calculate regression equations and to draw out iso-grams. the method shows good accuracy and reproducibility. Results show that the optimum microstructure and mechanical properties are achieved with proper RE,Mg and Cu ratios.
摘要:Efficient measures for improving properties of compound ceramic shell in which the bake-up slurry made of sodium silicate are following: selected refractory materials on the base of Kaolinite or Mullite, dried ceramic shell before curing and holding temperature at 700C while baking.
摘要:The effect of mechanical properties on Fe in rare earth hypereutectic Al-Si piston alloys has been investigated under room and elevated temperature. It is demonstrated that the room temperature strength, hardness decreases with the increasing of Fe content,the high temperature strength increases before the Fe content reach 0. 7% and decreases over. Its high temperature elongation change little while the Fe content is less than 1.0%.
摘要:This paper is systematical to introduce the unstalle cause of Ti-elememt in the smelting process of high tensile strength Al-Cu-Mu-Ti alloy and control method,and probes the factor effecting its mechanical property. And it gives comprehensive analyses and studies about how to control the mechanical properties of the alloy, in the way of metallograph, coupon quality,the time that Al-Mn master alloy is mixed in the alloy,the smelting,heat-treatment method and so on.
摘要:In this paper,author studies the silicaol surface of the combination mold shell used in investment casting at present. In order to obtain the desired quality of casting and satisfactory economic effectiveness,author selects alumine and silica to be the combined ingredients. This study has proved that the strength of combination mold shell under the room temperature and high temperature is higher than that of the single silicate mold shell under the room temperature and high temperature, that improves the surface quality of casting.
摘要:According to producing ZCuAi10Fe3 turbines, bushes by precision casting, and doing comparison experiments, the results show that precision casting filtering would remove a large amount of admixture and part of gas in the liquid alloy aluminum bronze, decrease defects in precision casting and increase mechanical properties and roughness of surface.