초록 ▼

The invention concerns an insulating material comprising 20-80 wt. % of a ceramic matrix, 5-40 wt. % insulating microspheres, 0.5-15 wt. % of one or more binders, and up to 5 wt. % water. The material may also contain 0.5-4 wt. % deflocculant and 0.5-4 wt. % colloidal silica. The ceramic matrix comp

The invention concerns an insulating material comprising 20-80 wt. % of a ceramic matrix, 5-40 wt. % insulating microspheres, 0.5-15 wt. % of one or more binders, and up to 5 wt. % water. The material may also contain 0.5-4 wt. % deflocculant and 0.5-4 wt. % colloidal silica. The ceramic matrix comprises vitreous grains, notably atomized silica. The insulating microspheres are hollow spheres comprising 55-65 wt. % silica and 27-33 wt. % alumina.

대표청구항 ▼

1. A refractory article adapted for use in the casting of molten metal comprising a body having an outer surface at least partially coated by an insulating refractory material made from a slip comprising 20-80 wt. % atomized vitreous grains of a refractory oxide, 5-40 wt. % aluminia-silicate insulat

1. A refractory article adapted for use in the casting of molten metal comprising a body having an outer surface at least partially coated by an insulating refractory material made from a slip comprising 20-80 wt. % atomized vitreous grains of a refractory oxide, 5-40 wt. % aluminia-silicate insulating microspheres, 5-25 wt. % water, and 0.5-20 wt. % of at least one binder conferring a viscosity greater than 8 Pa.s to the slip, wherein the insulating refractory material is formed by immersing the article at least partially in the slip and drying the slip to form the insulating refractory material.