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本文阐述了硅酸锆在釉料中产生乳浊的机理.比较了国内外几种不同粒度分布的硅酸锆在釉层中的遮盖力,并探讨了使用国产设备粉碎硅酸锆的优缺点。 相似文献
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硅酸锆具有优良的耐腐蚀性和良好的热稳定性等优点。但是,硅酸锆粉体的大晶粒尺寸和高烧结温度限制了它的应用。采用微乳液-水热法合成超细球形硅酸锆粉体,研究了超细球形硅酸锆合成机理和工艺条件。实验结果表明:采用微乳液-水热法获得硅酸锆前驱体。在前驱体中加入1 wt%的氟化锂(LiF),经900℃煅烧0.5 h能够合成晶粒尺寸为50 nm,平均粒径约为300 nm的超细球形硅酸锆粉体。 相似文献
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硅酸锆应用、生产工艺技术的发展及趋势 总被引:1,自引:0,他引:1
1硅酸锆应用的发展及趋势1.1硅酸锆的应用和发展硅酸锆是指锆英砂经过超细粉磨工艺加工而成的超细粉体。最初称之为"锆英砂超细粉",后逐渐规范称之为"硅酸锆"。这个名称已被广泛接受和使用。硅酸锆的应用和生产,在我国始于19世纪80年代末90年代初。 相似文献
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以无水四氯化锆为锆源、正硅酸乙酯为硅源、氟化锂为矿化剂、乙醇为溶剂、氟化锆为生长助剂,采用非水解溶胶-凝胶法制备硅酸锆晶须。借助综合热分析、X射线衍射分析、扫描电子显微镜和透射电子显微镜等研究了硅酸锆干凝胶在氮气气氛中热处理的物相变化以及成型压力、氟化锆用量对形成硅酸锆晶须的影响,探讨了硅酸锆晶须的形成机理。结果表明:氮气气氛下热处理并不影响硅酸锆的低温合成,成型压力过大或过小、氟化锆用量过多或过少均不利于硅酸锆晶体的一维择优生长,成型压力为2 MPa、氟化锆用量为10%(质量分数)时,硅酸锆晶须直径为0.2~0.4μm、长径比达到15~30。 相似文献
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Intumescent coatings are the newest passive fireproofing materials which maintain structural integrity of high-rise buildings in fire events. The present work focuses on the influence of zirconium silicate as a heat-stable filler in intumescent coatings. Different coatings were formulated by varying the zirconium silicate concentration from 1, 3, 5, 8, and 10 on parts per hundred basis (phr). Fire performance of the coatings was then determined by fire test using a Bunsen burner fire flame at 950°C for 1 h. The degradation of coatings was examined by thermogravimetric analysis (TGA). The morphology of the intumescent chars was analyzed by environmental scanning electron microscopy. The char was also examined by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy. XRD confirmed the inertness of zirconium silicate with intumescent ingredients at high temperatures. TGA showed an increase in the weight residue of char at high temperature. The incorporation of zirconium silicate into intumescent coating forms a thermally stable char with better substrate adhesion. EDS analysis confirmed an increase in the antioxidation property of the char, and the fire test also confirmed an increase in char strength of coatings by the incorporation of zirconium silicate. 相似文献
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Coatings on graphite that are stable to oxidation and based on the silicon–boron–zirconium boride composite containing from 5 to 50% of fibrous zirconium dioxide as a modifying dopant have been produced by the suspension–annealing method. A nonporous layer is formed at the zirconium dioxide content ranging from 5 to 15%, while a porous layer is formed at its 50% content. A glass-forming melt, as well as zirconium dioxide and silicate, is formed during thermal treatment as a result of the chemical reactions with the oxygen in air. The zirconium silicate content increases, along with the modifier’s concentration and temperature. 相似文献
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本文研究了锆英砂、碳酸钡、硅线石、氟化钙四种添加剂及其含量对合成堇青石晶相组成的影响。结果表明:四种添加剂的加入均提高了堇青石的含量,且加入量都有一最佳值,分别为锆英砂2wt%、碳酸钡3wt%、硅线石2wt%、氟化钙2wt%。 相似文献
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介绍了球磨超细硅酸锆湿法生产线的工艺流程、主要设备技术性能以及工艺特点.生产实践证明,该生产线工艺设计合理、设备性能优良、生产成本低,生产的超细硅酸锆达到了国内高档陶瓷釉料乳浊剂所要求的质量品级. 相似文献