Bone porcelain glaze 08

( 4) Bone China formula design of leadless fritted glaze is not very good empirical formula for reference. General reference to the existing mature formula was improved. In addition to bone porcelain glaze gloss, hardness, expansion coefficient and elastic, considering also fully considering the frit water-soluble and melt temperature, etc. A good frit formula must be high-temperature fusible but is insoluble in water, Or slightly soluble) 。 Melt temperature is too high, will lead the boron and fluorine components volatilization loss effectively; Water-soluble too high, not only make the bone porcelain glaze slurry liquidity is poor, but also lose the purpose of the preparation. The processing technology of the ceramic frit ( 1) Process specific technological process is: bone China material & rarr; Preparation & rarr; Mixed & rarr; Melted & rarr; Water quenching/rolling & rarr; The filter water & rarr; Packaging ( 2) Bone porcelain ceramic materials is the foundation raw material quality control, raw material quality is a prerequisite for determining the quality of clinker. Want to choose good raw material for bone porcelain glaze processing production. About the quality of the bone China material requirements are shown in table 4 - 2. Bone China ( 3) Bone China material granularity control dispensing frit material particles shoulds not be too large, the smaller the particle, the bigger the specific surface area, the lower melting temperature, melting faster on some refractory material such as quartz, feldspar, etc at least 40 days sieve, quartz fine point is good, but also should not be more than 200 mesh, lest appear together is not easy to melt mixing and cause. Bone China ( 4) Bone China material mix generally adopt the method of artificial multiple sieving or blender dry mixing method. First the refractory raw materials ( Such as quartz) Add a small amount of water wet, and then add flux materials ( Such as borax, boric acid, etc. ) Stirring, mixing, sieve, then add other bone China fully mixing raw materials, to ensure that the refractory material surface by flux packages fully, prompting refractory material surface eutectic formed under low temperature, achieve the goal of fast melting. Can also use the quantity of some kind of bone China material easily with less dosage of one or more of the raw materials mixed in advance, and then with the rest of the bone porcelain raw materials mix ingredients, large extent to improve the mixing uniformity of the clinker. Bone China ( 5) Melted lead-free frit has no definite melting point in the process of heating and reasonable system of melting temperature, melting cycles and melted atmosphere of clinker quality. Melt temperature is too low, frit raw serious, easy cause bone porcelain glaze pinhole, orange glaze, bone porcelain glaze bubble defects such as; Melting temperature, melting system cycle is too long, make the frit of fusible substances ( Such as borax, boric acid, calcium bicarbonate, etc. ) Volatile, not only cause the increase of energy consumption, reduced production, also changed the composition of clinker, affect the quality of clinker. General lead-free frit melting temperature is 1350 ~ 1450 ℃, drawing check no caking phenomenon, frit were shining brilliantly. Processed lead-free frit furnace use pool, so I can better ensure the quality of clinker. Bone China ( 6) Melted equipment piece of commonly used system of molten drop material type frit furnace, rotary furnace and melting pool. Drop the fed-batch frit furnace is characterized by small space, strong flexibility, low energy consumption, suitable for small batch frit processing production. Bone China rotary frit furnace energy consumption high, suitable for batch processing, work environment is relatively bad. Using pool frit furnace processing effect is good, but to invest big, suitable for mass production for the same formula, different fusion methods, the frit composition varies. Especially with pit furnace will be a part of the volatile substances, such as evaporation light calcium carbonate, and cause of change. Bone China & ndash; Bone China tableware to be continued. 。 。 。 。 。