An exhaust conduit for a glass melt system includes a corrosion resistant refractory conduit material, such as a conduit material including zirconia. The conduit can extend through a relatively dense refractory block material, such as a refractory block comprising alumina. The exhaust conduit can exhibit improved corrosion resistance in processing a variety of glass melt compositions.

The present invention provides a high alumina fused cast refractory that is easily produced and has low porosity and high corrosion resistance, and a method of producing the same. The high alumina fused cast refractory of the present invention has the following chemical composition: 95.0 mass % to 99.5 mass % Al.sub.2O.sub.3, 0.20 mass % to 1.50 mass % SiO.sub.2, 0.05 mass % to 1.50 mass % B.sub.2O.sub.3, 0.05 mass % to 1.20 mass % MgO and balance. The method of producing the high alumina fused cast refractory of the present invention includes obtaining a mixture by mixing an Al.sub.2O.sub.3 source material, a SiO.sub.2 source material, a B.sub.2O.sub.3 source material and an MgO source material, and fusing the mixture.

The present invention provides a high alumina fused cast refractory that is easily produced and has low porosity and high corrosion resistance, and a method of producing the same. The high alumina fused cast refractory of the present invention has the following chemical composition: 95.0 mass % to 99.5 mass % Al.sub.2O.sub.3, 0.20 mass % to 1.50 mass % SiO.sub.2, 0.05 mass % to 1.50 mass % B.sub.2O.sub.3, 0.05 mass % to 1.20 mass % MgO and balance. The method of producing the high alumina fused cast refractory of the present invention includes obtaining a mixture by mixing an Al.sub.2O.sub.3 source material, a SiO.sub.2 source material, a B.sub.2O.sub.3 source material and an MgO source material, and fusing the mixture.

A method of fabricating a turbine engine part, the method including fabricating an ingot out of ceramic material of eutectic composition by performing the Czochralski process including putting a seed of the ingot that is to be obtained into contact with a molten bath of a mixture of eutectic composition in order to initiate the formation of the ingot on the seed, the mixture including at least two ceramic compounds; drawing the ingot from the molten bath while imposing on the ingot that is being formed a drawing speed less than or equal to 10 mm/h together with rotation at a speed of rotation less than or equal to 50 rpm; and machining the ingot as fabricated in this way in order to obtain the turbine engine part.

The invention concerns a fused raw material for the production of a refractory product, a method for the production of the fused raw material and a use of the fused raw material.

Provided are electrofused alumina grains capable of preventing grain binding on production and of achieving high grinding performance. The electrofused alumina grains of the present invention contain at least either one of tungsten or molybdenum.

The invention relates to a refractory ceramic product.

The invention relates to a refractory ceramic product.

A molten refractory product having the following average chemical composition, in wt % on the basis of oxides and for a total of 100%: Al.sub.2O.sub.3: balance to 100%; Fe.sub.2O.sub.3: 0.6%-5.0% and/or TiO.sub.2: 1.5%-10.0%; Fe.sub.2O.sub.3+TiO.sub.210.0%; Na.sub.2O+K.sub.2O: 1.0%-8.0%; SiO.sub.2: 0.2%-2.0%; CaO+BaO+SrO: 0.5%; Other oxide species: 1.5%. Also, a glass-melting furnace and the use of the refractory product in the glass-melting furnace.

A molten refractory product having the following average chemical composition, in wt % on the basis of oxides and for a total of 100%: Al.sub.2O.sub.3: balance to 100%; Fe.sub.2O.sub.3: 0.6%-5.0% and/or TiO.sub.2: 1.5%-10.0%; Fe.sub.2O.sub.3+TiO.sub.210.0%; Na.sub.2O+K.sub.2O: 1.0%-8.0%; SiO.sub.2: 0.2%-2.0%; CaO+BaO+SrO: 0.5%; Other oxide species: 1.5%. Also, a glass-melting furnace and the use of the refractory product in the glass-melting furnace.