11 display bone China defects

5, thin bone porcelain glaze meaning: glaze surface of bone China products because of the glaze layer is too thin to form a partial or full is not bright, color is pale. Classified glaze thinner, produced in glazing causes: ( 1) Glaze slurry is too thin, too small proportion. ( 2) Bone China body was wet, 3) Soak decorated time too short or spray glaze times too little will cause the glaze layer overcome way: (is too thin 1) Bone porcelain embryo to glazing after drying. Under the condition of bone porcelain body allows, try to use a thick slurries ( 2) To improve the operation of the glazing technology, and strive to glaze, glaze speed control, check the glaze layer thickness of the blank after glazing, ensure uniform glaze layer thickness. ( 3) Glazing process always disturb slurries, prevent slurries precipitation, to keep the proportion of slurries uniform 6, bone porcelain glaze bubble meaning: bone porcelain glaze is also called the bubble. Its shape is not the bubble fusion of bone porcelain glaze, the another is along the edge sharp edges in the mouth of the bone porcelain products appear small glaze bubble, also called blister ( Tingling) 。 This kind of defect in art glaze are common, especially the copper red glaze and iron system aventurine glaze, glaze bubble serious, classification is a glaze bubble produced in glaze preparation and sintering process. The reason: 1) Raw material composition, the improper selection of clay will directly have bubbles, the reason is: grain carefully cover too much water, mud stale time is too long, the increased gas content by fermentation. In the process of refining, such as ball mill mixing will be more air into the mud. ( 2) Bone kilns of sagger green ( Commonly known as soil box) Put too much, or the birth in a bone porcelain blank cartridge, such burning bone China products, it's easy to occur bubble, for life magazine high moisture content, bone kilns in more water vapor, carbon deposition easily. In addition raw box to absorb heat is larger, the temperature of the measured does not reflect the real temperature of the body ( Bone China body for actual temperature is lower than the temperature of the measured) And insulation end too early, carbon materials such as not fully discharge thus under the high temperature decomposition of bubbles. ( 3) Burnt in the process of heating up too fast, the bone porcelain slab of organic matter in the glaze glaze melt before not yet fully decomposition and volatile. Iron content more glaze, in particular, in the process of melting, give off oxygen and sulfur gases such as lack of enough heat preservation time, the bubbles can't all glaze, or all, but not to all melting, especially the high temperature viscosity of glaze, insulation when short, this kind of phenomenon is more serious. With the increasing of temperature, the bone porcelain glaze has been formed after the glass layer, gas haven't vaporize clean, will break the bone porcelain glaze layer, phase to check the fire fire time is shorter, and quickly into the cooling zone, bone porcelain glaze bubble in three forms. 一个。 Gas rushed out after cooling too quickly, bone porcelain glaze leaving a small crater. b。 Gas rushed inside bone porcelain glaze layer, failed to break through and layer resistance, in the bone porcelain glaze layer formed a small round pearl, bone China products of bump is formed vesicles ( And sometimes large) , however the vesicle broken moment, oh to the smell of hydrocarbon, test acidic litmus test solution. C。 Under the bone porcelain glaze layer is formed, with small bubbles visible to the naked eye but not outstanding. Another kind is burnt in the high temperature or baffle wall of bone ceramic glaze of bubble, commonly referred to as far. — Bone China hotel furnishing articles to be continued. 。 。 。 。 。