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首页> 外文期刊>Journal of Materials Engineering and Performance >Study of Glazes and Their Effects on Properties of Triaxial Electrical Porcelains from Ugandan Minerals
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Study of Glazes and Their Effects on Properties of Triaxial Electrical Porcelains from Ugandan Minerals

机译：乌干达矿物釉料及其对三轴电瓷性能的影响

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摘要

Kaolin, ball clay, feldspar, and sand were collected from deposits in Uganda, milled and sieved to particle sizes of 45, 45, 53, and 25 μm, respectively. Three porcelain bodies and five glazes were formulated from them. The glazes were applied on porcelain specimens and subsequently evaluated for their effects on properties of porcelain samples. The formulated specimens were investigated using dilatometry, Steger test, FEG-SEM, XRD, 4-point bending, dielectric strength, and fracture toughness tests. A porcelain specimen consisting of 68% SiO_2, 19% Al_2O_3, 4.7% K_2O, and a glaze RO:0.57Al_2O_3:4.86SiO_2 exhibited MOR of 105 MPa with Weibull modulus of 5.6 and a dielectric strength of 18 kV/mm upon firing at a heating rate of 6℃/min to 1250℃ and holding for 2 h. The microstructure of the high-strength specimen exhibited round mullite needles, quartz, and glass. Holding samples for 2 h at peak temperature resulted in a 22% increase in MOR compared to 1 h holding. Glazing further improved strength by 67% for the best sample. Compressive stresses in glaze contributed to the strengthening effect. The dielectric and mechanical strength values obtained qualify the formulated sample for application in electrical insulation.
机译：从乌干达的矿床中收集高岭土，球形粘土，长石和沙子，分别研磨和筛分成45、45、53和25μm的粒径。用它们配制了三个瓷器和五个釉料。将釉料涂在瓷器样品上，然后评估其对瓷器样品性能的影响。使用膨胀计，Steger试验，FEG-SEM，XRD，4点弯曲，介电强度和断裂韧性试验研究了配制的试样。由68％SiO_2、19％Al_2O_3、4.7％K_2O和釉面RO：0.57Al_2O_3：4.86SiO_2组成的瓷器样品在105℃烧成时的MOR为105 MPa，威布尔模量为5.6，介电强度为18 kV / mm。以6℃/ min的速度升温至1250℃，并保持2 h。高强度试样的显微组织具有圆形的莫来石针，石英和玻璃。与保持1小时相比，将样品在峰值温度下保持2小时会导致MOR的增加22％。上光后，最佳样品的强度进一步提高了67％。釉料中的压应力有助于增强效果。获得的介电强度和机械强度值使配制的样品可用于电气绝缘。

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