摘要:
The invention relates to a powder comprising more than 70% of glass-ceramic and/or refractory particles, a particle of said powder being classed in the fraction called “matrix” or in the fraction called “aggregate” according to whether it is smaller than, or equal to 100 μm, or bigger than 100 μm, respectively, the aggregate, representing more than 60% of the powder, comprising: more than 40% of particles of a glass-ceramic material having a crystallization rate of higher than 50% and a thermal expansion value, measured at 700° C., of less than 0.3%, called “glass-ceramic grains”; less than 35% of particles of a refractory material different from a glass-ceramic material, called “refractory grains”, the quantity of refractory grains being higher than 10% if the aggregate comprises more than 40% of glass-ceramic grains having a thermal expansion value, measured at 700° C., of less than or equal to 0.15%; the matrix, representing more than 10% of the powder, comprising: less than 30% of particles of a refractory material different from a glass-ceramic material, called “fine refractory particles”, the quantity of fine refractory particles being higher than 5% and preferably lower than 25%, if the quantity of glass-ceramic grains having a crystallization rate of lower than 75% is higher than 5%; and between 0.1% and 18% of particles of a heat-activatable binder; all of the percentages being weight percentages in relation to the weight of the powder.
摘要:
The present invention resides in a refractory composition for use as a cold start slag band. The composition comprises an admixture of partially stabilised zirconia and/or fully stabilised zirconia and monoclinic zirconia, characterised in that the proportion of monoclinic relative to the total zirconia content is at least 40% by weight. The invention also resides in a slag band formed from the composition, a submerged entry nozzle incorporating the slag band and a method of forming such a submerged entry nozzle.
摘要:
A powder including: (a) more than 92% of zircon particles; (b) 1% to 2% of silica particles having a size less than 50 microns; (c) 0.3% to 5% of particles comprising one, two, or three oxides selected from CaO, MgO, and Y2O3; (d) less than 1% of particles comprising other oxides; the powder also being such that it includes: more than 5% of zircon aggregate particles having a size greater than 1 mm; and 8% to 20% of zircon matrix particles having a size less than 15 μm and including, for more than 95% of the weight thereof, a monoclinic phase.
摘要翻译:一种粉末,包括:(a)超过92%的锆石颗粒; (b)1%至2%的尺寸小于50微米的二氧化硅颗粒; (c)含有选自CaO,MgO和Y 2 O 3的一种,两种或三种氧化物的0.3%至5%的颗粒; (d)小于1%的包含其它氧化物的颗粒; 粉末还包括:大于5%的尺寸大于1mm的锆石骨料颗粒; 和8%至20%的尺寸小于15μm的锆石基质颗粒,并且包括其重量的95%以上的单斜晶相。
摘要:
A zirconia-carbon-containing refractory includes aggregate grains, a carbon bond formed between the aggregate grains, 80% by mass or more of a ZrO2 component, and a carbonaceous material, in which the total volume of open pores and the carbonaceous material in the structure of the refractory is in the range of 25% to 42% by volume, open pores each having a diameter of 10 μm or more account for 30% or less of the total volume of open pores in the structure of the refractory, and carbonaceous material grains each having a maximum length exceeding 45 μm in the carbonaceous material in the zirconia-carbon-containing refractory account for less than 60% by mass of the total mass of the carbonaceous material except the bonding carbon in the zirconia-carbon-containing refractory.
摘要:
An object is to provide a nonaqueous hot casting repair mix which, while enjoying simple and convenient installation, can substantially reduce hardening time after installation. The hot casting repair mix according to the invention is characterized by containing 5 to 30% by weight of a binder capable of forming a carbon bond in hot condition and 1 to less than 5% by weight of an iron powder and the balance consisting of a refractory aggregate.
摘要:
In one aspect, the present invention provides a method of providing a filling material for use in connection with an opening in a container used in molten metal processing including: recovering used refractory bricks; crushing the used refractory bricks into particles; and covering the opening with the particles.
摘要:
Compositions suitable for use as cores and shell molds for casting of reactive metal alloys, and casting processes for producing components from such alloys. The composition contains a sintered particulate material of hafnia and at least one additional metal oxide in amounts to yield a ceramic composition containing up to 70 molar percent of hafnia, wherein the additional metal oxide is a rare-earth oxide, the sintered particulate material contains first and second phases, the first phase is the rare-earth oxide and hafnia in solid solution, the second phase is a compound of the rare-earth oxide and hafnia, and the second phase is less reactive with the reactive metal alloy than the first phase.
摘要:
An additive to foundry sand molding and core aggregates is used to produce sand cores and molds. The additive produces a sand-based foundry molding and core aggregate which resists the formation of some of the defects commonly associated with the production of castings produced by silica sand-based molding and core aggregates. In particular, the additive improves the quality of castings poured at temperatures higher than those of the pouring temperatures of molten iron, such as in steel castings and in iron castings with “hot spots.”
摘要:
The invention relates to a fired refractory ceramic product and a batch that can be used to produce said product. Both the batch (the mixture) and the prepared fired product contain spinels consisting of MgO and Al2O3.
摘要翻译:本发明涉及一种烧制的耐火陶瓷产品和可用于生产所述产品的批料。 批料(混合物)和制备的烧制产物都含有由MgO和Al 2 O 3 3 3组成的尖晶石。