摘要:The shape, size and distribution of the eutectic silicon particles in Al-Si alloys could be improved effectively by heat-treatment. And so Al Si alloys could have better mechanical properties. The eutectic silicon particles in unmodified Al-Si alloys, which also have high energetic inhomogeneity in casting states,could be spheroidized rapidly.
摘要:In this paper; the influence of pouring temperature, properties of polystyrene foam and modulus of casting sections on the temperature distribution during filling mold for Al-Si alloy, as well the scab formation on the casting surface in evaporative pattern casting process is studied
摘要:By means of orthogonal expriment method, the chemical compositions of a Al-Pb-Cu antifriction alloy are designed and a new type of aluminum base antifriction alloy has been developed.Testing results show that it is possible to replace the tin bronze as making some bushes and axle sleeves.The alloy costs 4/5 less than the tin-bronze ZQSn6-6-3.
摘要:The process of shell moulding with composite coatings of colloidal silica and sodium silicate is discussed in this paper. The physi-cochemical change during combined drying by far infraredhet blast is investigated. Several strengthening solutions for interface of the composite are developed.Practical experience shows that the process can improve the casting surface roughness and size precision 1-2 grade compared with process of the shell moulding with sodium silicate, and can reduce the production cost of castings 3900 yuan per ton comparad with process of the shell moulding with ethyl silicate (30) .
摘要:The lubricant of plunger is made from natural oil and some functional additives by means of chemical polymerization and the lubricant is excellent in the technological characteristics. This paper introduces the technological process of polymerization,testing contents and methods, performance index and practice of the lubricant.
摘要:This paper probes the relationship between mechanical property and chemical composition, tensile strength and hardness in the casting of non ferrous metals in order that the optimal mechanical performance can be attained.
摘要:Two kinds of additives are chosen for improving collapsibility of ceramic mold.Experiments and studies show that the carbon-base or the resin-base additives can impede or reduce sintering. The additives make the shake-out efficiency of ceramic mold distinctly be enhanced
摘要:The mechancial properties and metallographic structure of Al 12Si 2Cu alloys with 0.10.25 wt% mischmetal have been investigated on the gravitational and pressure casting samples. The fluidity of the liquid alloys and thermal cracking stress of the alloys in solidification determined.It was shown that if additional 0.10.25wt% mischmetal is added to the Al-12Si-2Cu alloy, the primary a Al phase will be preferentially formed, and the eutectic silicon phase will be informed of a small bar or a particle, but not a needle. As a result, the strength and the elongation of the alloy were increased and the resistance to thermal cracking was obviously improved.