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INFLUENCE OF SOME TRANSITION METAL CATIONS ON THE PROPERTIES OF BaO-CONTAINING GLASSES AND GLASS-CERAMICS

机译:某些过渡金属阳离子对含BaO的玻璃和玻璃陶瓷性能的影响

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Copper, iron, and manganese oxides were added separately to melts of BaO-MgO-Al_2O_3-SiO_2 glasses up to a maximum of 5 moI/100, than devetrified at l00 C for l h. The transition cations acted as fluxes on the glass properties by reducing the temperature of glass transition and the exothermic crystalli- zation peak temperature. The activation energy for crystallization was slightly reduced, remaining in the fieldspatic phase range. The effects on other prop- erties, such as hardness and toughness, were evaluated in terms of indentation tests and related totation field strength and heating treatment. The presence of copper and manganese oxides inhibited the formation of hexacelsian crystals in the glass-ceramics, thus avoiding dangerous dimensional stress due to phase transformation. The complex evolution of the remaining crystalline phases is discussed in light of XRD, FT--IR, and SEM observations.
机译:将铜,铁和锰的氧化物分别添加到BaO-MgO-Al_2O_3-SiO_2玻璃的熔体中,最高至5 moI / 100,而不是在100°C下脱硝1小时。过渡阳离子通过降低玻璃化转变温度和放热结晶峰温度,充当玻璃性能的助熔剂。结晶的活化能略有降低,保持在场相范围内。通过压痕测试,相关的场强强度和热处理评估了对其他性能(如硬度和韧性)的影响。铜和锰的氧化物的存在会抑制玻璃陶瓷中六方晶的形成,从而避免了由于相变而引起的危险的尺寸应力。根据XRD,FT-IR和SEM观察结果讨论了剩余结晶相的复杂演化过程。

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