CaO/MgO对黄兔毫釉毫纹的影响研究

Effect of CaO/MgO on Strips in Yellow Hare's Fur Glaze

兔毫釉属高温钙釉,实验以红土、草木灰、石灰石等为主要原料,采用电窑在氧化气氛中烧制,研究了不同CaO和MgO的相对含量对釉面毫纹的影响。实验结果表明:当CaO和MgO的摩尔比为(0.40∶0.38)~(0.45∶0.33)时,釉中显微结构析出枝状ε-Fe_(2)O_(3)晶体较少,尺寸约150nm~250nm,釉面呈颜色较浅的毫纹;当CaO和MgO的摩尔比增至(0.50∶0.28)~(0.55∶0.23),釉中所析出的ε-Fe_(2)O_(3)晶体呈短柱状,尺寸约70 nm~150 nm,釉面毫纹数量增加;当CaO和MgO的摩尔比增至(0.60∶0.18)~(0.65∶0.13),釉中所析出形态为枝状晶花ε-Fe_(2)O_(3)晶体数量较多,釉面呈现数量多、形态粗的黄色毫纹;当CaO和MgO的摩尔比增至0.70∶0.08,釉中析出了钙长石晶簇和黄色ε-Fe_(2)O_(3)枝状晶花,钙长石周围易形成富Ca、Fe的分相结构,促进了ε-Fe_(2)O_(3)枝状晶花的析出,导致釉面形成形态较粗的橘黄色兔毫纹。

Hare's fur glaze is a high-temperature calcium glaze.With laterite,grass ash and limestone as the main raw materials,the effect of different CaO/MgO molar ratios on the hair pattern of the glaze was studied.When the CaO/MgO molar ratio is the range of(0.40:0.38)-(0.45:0.33),dendritic e-Fe203 crystals with sizes of 150-250 nm were precipitated,so that the glaze surface is lightly coloured with strips.When the Ca0/Mg0 molar ratio increases to(0.50:0.28)-(0.55:0.23),the ε-Fe_(2)O_(3) crystals precipitated in the form of short columns,with sizes of 70-150 nm,with an increase in the number of strips on the glaze.As the CaO:Mg0 molar ratio increases to(0.60:0.18)-(0.65:0.13),a relatively large number of ε-Fe_(2)O_(3) crystals are present in the form of dendrites in the glaze,forming coarse yellow strips on the glaze.When the Cao/MgO molar ratio increases to 0.70:0.08,calcium feldspar crystal clusters and yellow ε-Fe_(2)O_(3) dendritic crystals are precipitated.Meanwhile,Ca and Fe rich fractal structures are formed around the calcium feldspar,which promoted the precipitation of ε-Fe_(2)O_(3) dendrite flowers,leading to the formation of thick orange rabbit pattern on the glaze.