Quartzite microcrystallite glass ceramics is one of the most promising machinable ceramic materials due to its many outstanding properties. The density of quartzite microcrystallite glass ceramics is smaller than the aluminum alloy and its thermal conductivity approaches to the zirconia and its elastic module is also very small; All these advantages meet the requirements for structural components to work at higher temperature; Compressive properties of quartzite microcrystallite glass ceramics had been studied at room temperature and 500°C in this paper; The specimens had been aged at 1000°C for 5, 10, 20, 30 hours, respectively. Through SEM observations of the fracture surface of the specimens, the microstructural changes had been determined; The tests showed: the compressive property of the machinable glass ceramic declined as the ageing time increasing; but the compressive property of the specimen aged for 10 hours was inferior to that aged for 20 hours; Then compressive property declined as the ageing time increasing. The SEM observation indicated that with the extend of ageing time, the grains grew bigger and microporous and microcracks increased in the specimens; Comparing the compressive property at room temperature with that at 500°C, one found that the change of compressive property was very small when the ageing time was the same; With the extend of ageing time, the curve of the compressive property changed from smooth curves to broken lines.
In this paperthe silver particle was adhered to the sponge by different ways and the sponge became to resistance bacterium. The AgNO3 reduced by SnCl2 is the best way via testing the weight gain rate and the antibacterial effect. By comparing the weight gain rate and the antibacterial effect at different concentration, it was found that, when the sponge was soaked in SnCl2 solution at a concentration of 0.10mol/L and AgNO3 solution at a concentration of 1.00mol/L, the sponge prepared by this method had the best antibacterial effect of 99.9%, in which adhered silver particle had uniform distribution and are difficult to fall off.
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