The Beijing Aeroautic Material Institute Jin Changgeng The Shenyang Aeroplane Manufacturing Company Tian Jiulin
Issue 2, Pages: 3-7(1988)
摘要:The sponge porosity in aluminum alloy castings is one of the chief and common defects. It will undoubtedly cause a reduction of the mechanical property of the castings, when it exists in aluminum alloy castings. The relationship between the sponge porosity of 1 to 5 grades in aluminum alloy castings and the mechanical property, the pressure tightness and hydraulic resistance has been emphatically studied ia this paper. ZL101 alloy and two kinds of thickness was used in the experiments. This subject will provide an important basis for the designing and inspecting of the castings.
The Beijing Machinery & Electricity Institute Jin Dazhou The Haerbing University of Science & Technology Ge Fengde
Issue 2, Pages: 8-11(1988)
摘要:In the paper, it was firstly described to use phosphorus and mixed light rare earth as a co-inoculator of Al 18%Si hypereatectic alloy. In the experiments,P-RE co inoculating technology was studied. Meanwhile, the research On hypereutectic alloy structure and other properties affected by added P RE. The co inoculator was carried out. It was testified by experiment result that Al-Si hypereutectic co-inoculated by P-RE could have good comprehensive properties and P-RE co-inoculation is an ideal twofold technology.
摘要:The effect of filtration on solidification parameters and solidified structure of Al-5 %Cu alloy added with Ti and B-Ti was studied by means of contrast of thermoanalysis. The macrostructure of Al-5%Cu alloy added with Ti and B-Ti is coarsened by filtration and the micro-structure of the alloy is slightly coarsened. The content of Ti and B in Al-5%Cu alloy is reduced after filtration.
摘要:Research was made on hydration and gelation of plaster, expansion and strengthening of plaster gel in accordance with the requirement of art casting.The cracking tendency and bending strength were tested. The calcining of plaster mold is significant.The temperature field of plaster mold under one-dimansional thermal conduction using heating method was recorded and temperature conductivity awas calculated. It is emphasized that plaster mold ingredient and process should be designed on the basis of peculiarity of art articles. Several process examples of art and sculpture also are shown in this paper.