摘要:The optimum composition and effect of adding tin and phosphor for improved corrosion and fouling resistances of high strength brasses have been investigated. The following conclusions can be reached from this investigation,1 . The fouling resistance is improved effectively when >0.6% Sn or phosphor were added.2. A new type of brass-58% Cu, 3% Mn, 1% Fe, l% Al, 0.6% Sn possesses good resistances against corrosion and fouling of marine organism.
The Nanchang Aeronautical Polytechnic InstituteZhou Shanmin
Issue 3, Pages: 6-8(1988)
摘要:In this paper, the pinhole, shrinkage cavity, porosity and oxide inclusions of Al-alloy crankshaft-box are observed with scanning electron mic-roscory. The composition of inclusions from its microstructure is determined with the energy spectrometer) and analysed for the forming cause of the defect
摘要:Authors have carried out experimental investigation on elevated properties of some coatings. The elevated strength is measured with the device, Apart from this, the gassing property crack resistance as fast heated and the suspensibility is also discussed.
摘要:According to the rule of gypseous mould having different change of crystal structure at different temperature, the relationship between baking temperature and time of gypseous mould and its drying degree were studied, the strength of gypseous mould at different baking temperature measured, several methods of examinating drying degree of gypseous would was presented in this article.
摘要:The experimental Procedure, test results and mechanism of air-exp losive cleaning for investment casting have been introduced in this paper. The results would show that air-pressure of 0.2-0.4 MPa may be well used for investment casting cleaning, where the casting surface without hollows or slits, higher air-pressure may be used if casting surface has hollows or slits depend on casting construction.
The Beijing Aeronautic Materials Institute Ma Jinying
Issue 3, Pages: 19-22(1988)
摘要:A series of WM pattern wax for investing casting are investigeted. The strength,elewetting ability with the slurry, the thermal expansibility, and the technical propertion of the series wax are discussed in the paper. The technical parameter for getting-patterns with high dimensional tolerance are also discussed, and the properties of WM pattern wax are compared with domestic and foreigh wax.
The Beijing Motor cycle Manufacturing Factory Wang Yanke
Issue 3, Pages: 23-27(1988)
摘要:The hub of motor cycle is a casting that bears heavy load. Casting engineers may choose one of three kinds of the methods to produce it, that are permanent mould casting,low pressure casting and die casting, according to the amount of the production. This article describes the design procedures of those dies and mould and designed principle of the particular parts of them.