摘要:According to an amount of experimental data associated with the experimental conditions,the modified threshold value using sodium compounds has been determined in gravity die casting of ZL102. The effect of the pressure on the threshold value has also been investigated in the double-process of modification and squeeze casting. On the basis of them,we derived the experimental formula between the pressure and the properties HB). Thereby,we found an quantitative calculated method that could be used to define the optimum pressuer parameter.
摘要:By comprehensive comparing,this paper shows that the quality of the colloidal silica produced by Wuhan Chemical Plant is equal to that of Monsanto Corporations high quality colloidal silica. In order to short the period of preparing a shell mould,the new technology of alternate hardening of acid and alkaline colloidal silica is also studied.
摘要:In this paper,the low-fold structure of different negative pressure are compared with the low-foid structure of normal pressure (0. 1 MPa)by the fashion of decompression solidification,and so lead in the concept of quantity. We can fast detect the low-fold structure of aluminium in furnace and optymum effect of the refining agent used by this way.
摘要:This paper has studied the role of modification of RECl3 in ZL107A Alloy producingThe test-ing results show that REC13 modifier has good permanent effect of modification on Al-Si Alloy It can increase the tensile strength of Al-Si alloy by 28% increase the longation of Al- Si alloy by 70% ,and decrease the needle hole of Al-Si alloy
摘要:The german silver scrapper blade produced has exported successfully to the U. S. A. It is a swith to solve the problem that using the degassing agent W in the investment. And the castings must be close to the mon-porosity specified