摘要:In this paper,the mathematical foundation of regression analyse is introduced and as an example the application of regression analyse for cast aluminium copper alloys is described.
摘要:The shell mould produced by magnesium chloride as hardening agent has a higher strength at room temperature, its high temperature strength is as good as that of shell mould for ammonium chloride, it is easy to clean and has a low-cost. If it is applied widely, it will make a large economic benefit.
摘要:The greater the content of A12O3 in aluminium alloys, the higher the rate of pinholes in samples of the alloys under the condition of de-slagging and de-gassing flux "DSG" in ZL104 alloy, the content of A12O3 and hydrogen was decreased so that the rate of the pinholes was decreased. The mechanism of formation for slag-gas holes is studied also.
摘要:In the present paper, the pressure of molten metal during filling mould was measured using precise self-made barometer The mecallographical structures of die casting were examined and tensile test was mt.de on those castings. The rule for pressure transfer during the process of filling mould and its influence on the quality of die castings are revealed.
摘要:In order to save expensive tin, this paper studies the tinless copper base alloys. It is used instead of tin bronze(ZQSn6- 6-3). The exerimental results show that besides the coefficient of linear expansion is higher, the mechanical properties and corrosion resistance of new alloys is optimum than tin bronze.
摘要:A device for thermal fatigue tests has been developed. The speciments can be heated and cooled automatically according to experiment conditions given.It is simple and runs dependably, especially suits thermal fptigue tests of nonferrous metal.
摘要:In this article, the importance of plaster and mixture plaster,the key points of major factors affecting among the test and production the present of technical indexes and the basis for checking test besis in are investigated based on the test and productive experience.