Li 2 O-ZnO-SiO 2 (LZS) glass-ceramics in stead of traditional hot-resistant glass were used as anodic bonding materials. The CTE of LZS system is high enough to be used as anodic bonding material with 430 # stainless steel. The glass-ceramics were obtained after tow-step heat-treatment. The crystalline phases of the glass-ceramics were investigated by means of the XRD. The results show that most of the main crystal phase of the samples is Li 2 Si 2 O 5. But the main crystal phase will change with the change of the content of alkali metals. The bending strength of this system is measured by bending strength test instrument and it also high enough to meet the requirement as anodic bonding with the stainless steel.Table1 The Main Chemical Composition of Group A (wt %)
The fatigue behaviour of A356 cast aluminium alloy under 10 4 cycles was investigated by a servohydraulic machine at the temperature of 150uC. The specimens for the fully reversible tension compression tests were cut from cylinder head castings of automobile engines. The testing data were treated by S-N curve and the staircase method and the mean values of fatigue property coincided with each other by these two methods, though the data scattered with different casting defects. The fracture surfaces of fatigue specimens were examined by OM, SEM and EDS. It was found that in most of the specimens two or more fatigue crack initiations appeared at a fracture surface. Compared with casting defects such as oxide film, inclusion and blowhole, shrinkage porosity is more detrimental to the fatigue behaviour of aluminium alloy castings.
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