【作者】 韩廷恩；

【导师】 徐晓虹； 王树海；

【作者基本信息】 武汉理工大学 ， 材料工程， 2003， 硕士

【摘要】 作者开发了二种低温快烧亚光熔块釉，其中一种用在炻质墙地砖上，另一种用在精陶质内墙砖上。采用DTA、DDTA、XRD、OM、SEM和高温显微镜，研究了CaO—MgO—SiO₂系统熔块的晶化行为，计算了熔块中晶体的生长活化能，分析了热处理过程中烧结与晶化的关系。对该种熔块用在上述二种亚光釉中的作用进行了介绍和验证。同时研究和分析了上述两种亚光釉的性能、组成和显微结构，探讨了亚光釉的形成机理，并对其生产工艺作了介绍和分析，结果表明 （1）不同程度地引入了MgO、BaO、CaO、Li₂O₃、ZnO它们起到了无光剂的作用，这二类亚光釉中析出的晶相以透辉石为主（CaMg（Si₂O₇）），此外还有锂辉石（LiAl（Si₂O₆））、钡长石、（CaO·Al₂O₃·2SiO₂）、钡铁钛石（BaFe₂Ti[O₃|Si₂O₆]）、钙长石（CaO·Al₂O₃·2SiO₂）、α-石英。晶粒尺寸大部分在3～10μm它们在釉表层的均匀堆叠和对可见光的散射使釉面产生了亚光效果。 （2）在CaO—MgO—SiO₂三元相图中的透辉石析晶区中，选取了一个合理的熔块组成，在此基础上以BaO取代相当量的CaO，并引入了ZnO、LiO₂等组分，构成熔块配方在1560℃下熔制，熔块中的主晶相为透辉石晶粒，尺寸大部分在3～10μm，该晶相可以在较宽的温度范围内析出，是热力学角度上能稳定存在的晶相。 （3）亚光釉的Al₂O₃/SiO₂比靠近1/6这个界限，无光釉的则靠近1/3这个界限。 （4）亚光釉的形成除了要有合理的配方外，烧成制度是个关键，烧成温度过高，会导致早期析出的晶体重新溶解，这样釉中玻璃相增加，物相以玻璃相为主，亚光釉变成光泽釉；反之烧成温度过低，则会导致生烧，造成 武汉理工大学硕士学位论文非均匀成核，釉面晶粒过细过多、光泽暗淡失去亚光效果。此外合理的保温时间和冷却制度也是烧成制度的重要组成部分，是形成优质、无光釉效果不可缺少的保证。 （5）低温快烧亚光、无光釉最好以熔块釉的形式生产。与生料釉相比熔块釉的适应范围宽、生产较稳定、釉面质感也好。更多还原

【Abstract】 Two kinds of low-temperature fast firing mat frit glazes were developed, of which one was used in stone tile, and the other was used in fine pottery tile. The crystallization of the diopside in the CaO-MgO-SiC2 frit was studied by means of DTA, DDTA, XRA, OM, SEM and high-temperature microscope. The activation energy of the crystal growth was calculated. The relationship between sintering and crystallization in the heat treatment process was analyzed. Effects of the frit used in the above two kinds of mat glazes were investigated. The properties, compositions and micro-structures of mat glazes were studied. The forming mechanism and process conditions of mat glazes were discussed. The results show that as follow.(1) MgO, BaO, CaO, Li2O3, ZnO introduce perform a function as non-1 ight agent, the main crystal phase of two kinds of mat glazes is diopside. In addition, there are many phases such as lithium silicate, barium feldspar, anorthite, a -quartz. Crystal grain size is 3~10 u m mostly, piling equally at the glaze and scattering to visible light which make a semi- light effect.(2) Selecting proper compositions of the frit in crystallization section of diopside from CaO-MgO-SiO2 three phase diagram, we replace quite quantities of CaO by BaO and induced composition such as ZnO, LiO2. Proposition of the frit is melted at a temperature of 1560癈, the main crystal phase of the frit is diopside, crystal grain size is 3~10u m mostly. The crystal phase could analyze at a broad extension temperature, which is stable crystal phase according to thermodynamics.(3) The proportion of Al2O3:SiO2of the mat glaze is near to 1:6, while thatof non-light glaze is near to 1:3.(4) Firing schedule is a key to formation of the mat glaze besides proper proposition, extremely high firing temperature may lead to early crystallization to dissolve again, which make the glass phase increasable. The mat glaze become to the blare glaze, the main phase is the glass phase. Contrarily, low-temperature firing may lead to non-equal grown of nucleus; the grain is too thin and excessive which make semi-light effect is lost. Proper heat preservation and cooling schedule are the important composition and indispensable assure to form excellent non-light glaze.(5) The semi-light glaze and the matt glaze in a fast-firing condition at a low temperature produce in form of the fritted glaze, compared to the raw glaze, the fritted glaze have broad adaptability and stable manufacture and good surface feeling of glaze.更多还原