Bone porcelain blank 12

( 1) Liquidity is better bone China mud of liquidity, i. e. viscosity is smaller, so that we can ensure the slurry flow to model any part of the inner chamber, ensure the integrity of the shape and sex. Bone China pulp outflow from the hole should be able to connect constantly filaments; After filed sticks into pulp, bone China mud should flow into a continuous line. ( 2) Stability ( Suspended) Bone China mud solid particles can be suspended for a long time, can keep unchanged for a long time of components, components, after forming the parts that make up evenly, won't appear precipitation phenomenon. ( 3) Thixotropy bone China mud should have appropriate thixotropic. Bone China mud viscosity changes after static over a period of time shoulds not be too big, put the pulp thickness of billet body surface is smooth, after one; At the same time, not after demoulding will soft collapse deformation by slight vibration. ( 4) Hydrophobic hydrophobic moderation, or sexual moderation, that is to say, the moisture in bone China mud walls can smoothly through the adhere to the bone China model layer and absorbed by the model. Hydrophobic good, eat too fast, people empty pulp slower produce bone porcelain body thicker, or even the phenomenon of uneven; Poor hydrophobicity, too slow, eat pulp production cycle is longer than the shape of complex products to hydrophobic regulation of bone China mud can be a bit low, and the shape is simple and small can adjust a bit higher hydrophobicity. ( 5) Stripping resistance stripping should be combined with hydrophobic, bone China body formed to easy demoulding bone China ( Bone China) Because contain more calcium, generally prone to release bad problem, adopted the practice of beating is preparation of ceramic slurry ejection. Demoulding too fast at the wall, easy to deformation, defects such as mud; Demoulding too slow, not only influence the production efficiency, but also for complex shape bone porcelain products easy to appear crack phenomenon. ( 6) Moisture content on the premise of ensuring liquidity, bone China mud water less is better. Mainly is to reduce the drying shrinkage, reduce crack, eating time, reduce the amount of water model of bone China, extend the service life of mould, improve the yield. ( 7) Strength after forming the bone China body should have appropriate intensity, to facilitate later researchers or mechanical operation. ( 8) Bubbles are not allowed to be contained in the ceramic slurry bubble, are generally treated with vacuum degassing pulp, reduce internal bubbles, thus reducing the brown eyes or cracking defects. Also note that in the process of grouting for bone China mud dump rushed up the bubble surface defects. Bone porcelain ceramic mud slurry process performance adjustment process performance shall, according to the shape of the products, large, dry degree of thickness, gypsum mould and pouring method to decide. Ceramic slurry in order to meet the above process performance, can generally through the amount of clay in the ceramic slurry, adjust to control of electrolyte content, moisture content etc. In the formula design and process control should pay attention to the following questions. ( 1) The amount and type of clay bone China ( Bone China) Formula is commonly: bone meal 40% ~ 60%, 8% ~ 22% feldspar, quartz 8% ~ 20, clay is 25% ~ 45%. Amount of clay is 25% ~ 45%, less than the average daily porcelain clay total, so pay special attention on the composition of clay with a compound clay were used to ensure that the use of ceramic slurry. (1) 3% ~ 5% of bentonite, improve the strength, enhance the stability of ceramic slurry, improve demoulding properties; (2) knag clay 3% ~ 5%, improve the hydrophobic properties of ceramic slurry; — Bone China life of bowl to be continued. 。 。 。 。 。