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    • 9. 发明申请
    • A MOULD AND A METHOD FOR THE CASTING OF METALS AND REFRACTORY COMPOSITIONS FOR USE THEREIN
    • 用于铸造金属和耐火材料组合物的模具和方法
    • WO1994023865A1
    • 1994-10-27
    • PCT/GB1994000750
    • 1994-04-08
    • FOSECO INTERNATIONAL LIMITEDGOUGH, Michael, John
    • FOSECO INTERNATIONAL LIMITED
    • B22D07/10
    • B22D7/102B22C9/084B22C9/088B22D7/10
    • A mould for metal casting contains a bonded refractory composition comprising hollow alumina-containing microspheres in which the alumina content is at least 40 % by weight. The mould may be an ingot mould and the bonded refractory composition may be in the form of a sleeve or boards located in the top of the mould or in the head box thereto. The mould may be a sand mould and the bonded refractory composition may be in the form of a sleeve or boards located in a feeder cavity or in the form of a board or pad located so as to constitute a metal casting surface where it is desired to promote directional solidification in cast metal. The bonded refractory composition may also be in the form of a breaker core. In a preferred composition the microspheres contain alumina and silica and the composition may also contain one or more other particulate refractory materials, a readily oxidisable metal, an oxidising agent for the metal and a fluoride salt.
    • 用于金属铸造的模具包含粘合的耐火材料组合物,其包含中空氧化铝的微球,其中氧化铝含量为至少40重量%。 模具可以是铸锭模具,并且粘合的耐火组合物可以是位于模具顶部或头箱中的套筒或板的形式。 模具可以是砂模,并且粘合的耐火材料组合物可以是位于进料器腔中或以板或垫的形式的套筒或板的形式,其定位成构成金属铸造表面,其中期望 促进铸造金属的定向凝固。 粘合的耐火材料组合物也可以是断屑芯的形式。 在优选的组合物中,微球体包含氧化铝和二氧化硅,并且组合物还可以含有一种或多种其它颗粒耐火材料,易氧化性金属,金属氧化剂和氟化物盐。