A method of laser-curing and forming a honeycomb diamond grinding block made from fine-grained diamonds and a ceramic binding agent is provided. The method includes preparing a slurry, where components of the slurry, by mass ratios, include: 20-21 parts of photosensitive resin; 34.5-37 parts of aluminum-oxide powder; 4-5.5 parts of fine-grained diamond powder; 0.04-0.1 parts of a photoinitiator; a range of particle sizes of the fine-grained diamond powder is 6-8 m; stirring the slurry to allow all components in the slurry to be fully mixed with each other to obtain a first printing material; feeding the first printing material into a light-curing printer to perform light-curing 3D printing to obtain a precursor of a finished product; and performing, by a high-temperature furnace, a degreasing operation and a high-temperature sintering treatment on the precursor to obtain the finished product of the honeycomb diamond grinding block.

A method of laser-curing and forming a honeycomb diamond grinding block made from fine-grained diamonds and a ceramic binding agent is provided. The method includes preparing a slurry, where components of the slurry, by mass ratios, include: 20-21 parts of photosensitive resin; 34.5-37 parts of aluminum-oxide powder; 4-5.5 parts of fine-grained diamond powder; 0.04-0.1 parts of a photoinitiator; a range of particle sizes of the fine-grained diamond powder is 6-8 m; stirring the slurry to allow all components in the slurry to be fully mixed with each other to obtain a first printing material; feeding the first printing material into a light-curing printer to perform light-curing 3D printing to obtain a precursor of a finished product; and performing, by a high-temperature furnace, a degreasing operation and a high-temperature sintering treatment on the precursor to obtain the finished product of the honeycomb diamond grinding block.

A refractory to be used repeatedly or for a long period of time, such as a refractory for casting, especially a nozzle for casting and an SN plate, has improved tolerance. The refractory for casting contains Al.sub.4O.sub.4C in the range of 15 to 60% by mass, both inclusive, an Al component as a metal in the range of 1.2 to 10.0% by mass, both inclusive, and a balance including Al.sub.2O.sub.3, a free C, and other refractory component; a sum of Al.sub.4O.sub.4C, Al.sub.2O.sub.3, and the Al component as a metal is 85% or more by mass; and a content of Al.sub.4O.sub.4C (Al.sub.4O.sub.4C), a content of the Al component as a metal (Al), and a content of the free carbon (C). The contact of the free carbon satisfies the following Equation 1 and Equation 2:
1.0C/(Al.sub.4O.sub.4C0.038+Al0.33)(Equation 1)
and
1.0C/(Al.sub.4O.sub.4C0.13+Al0.67)(Equation 2).

A refractory to be used repeatedly or for a long period of time, such as a refractory for casting, especially a nozzle for casting and an SN plate, has improved tolerance. The refractory for casting contains Al.sub.4O.sub.4C in the range of 15 to 60% by mass, both inclusive, an Al component as a metal in the range of 1.2 to 10.0% by mass, both inclusive, and a balance including Al.sub.2O.sub.3, a free C, and other refractory component; a sum of Al.sub.4O.sub.4C, Al.sub.2O.sub.3, and the Al component as a metal is 85% or more by mass; and a content of Al.sub.4O.sub.4C (Al.sub.4O.sub.4C), a content of the Al component as a metal (Al), and a content of the free carbon (C). The contact of the free carbon satisfies the following Equation 1 and Equation 2:
1.0C/(Al.sub.4O.sub.4C0.038+Al0.33)(Equation 1)
and
1.0C/(Al.sub.4O.sub.4C0.13+Al0.67)(Equation 2).

Methods for forming monolithic refractory compositions may include providing a particulate refractory composition including 2 to 90 mass-% alumina, aluminosilicate, or mixtures thereof; 2 to 70 mass-% silicon carbide; 2 to 10 mass-% carbon; 1 to 10 mass-% Si powder; 1 to 3 mass-% microsilica; and up to 5 mass-% ferrosilicon. The methods may further include adding an amount of water to the particulate refractory composition to form a uniform mixture, installing the uniform mixture and allowing it to set, such that the monolithic refractory composition is required, and heat-treating the set mixture at a temperature no higher than 1200 C. under atmospheric conditions to form a monolithic refractory composition. The methods may optionally include heat-treating the obtained monolithic refractory composition to form silicon carbide whiskers within the monolithic refractory composition.

Methods for forming monolithic refractory compositions may include providing a particulate refractory composition including 2 to 90 mass-% alumina, aluminosilicate, or mixtures thereof; 2 to 70 mass-% silicon carbide; 2 to 10 mass-% carbon; 1 to 10 mass-% Si powder; 1 to 3 mass-% microsilica; and up to 5 mass-% ferrosilicon. The methods may further include adding an amount of water to the particulate refractory composition to form a uniform mixture, installing the uniform mixture and allowing it to set, such that the monolithic refractory composition is required, and heat-treating the set mixture at a temperature no higher than 1200 C. under atmospheric conditions to form a monolithic refractory composition. The methods may optionally include heat-treating the obtained monolithic refractory composition to form silicon carbide whiskers within the monolithic refractory composition.

A composition for coating a refractory body. The composition comprises; an oxidizable component; and a phosphate frit comprising phosphorous oxide. The composition is substantially aluminum metal free.

A composition for coating a refractory body. The composition comprises; an oxidizable component; and a phosphate frit comprising phosphorous oxide. The composition is substantially aluminum metal free.

A castable refractory composition comprises: a cement-free refractory particulate composition; and a sol binder; wherein the castable refractory composition comprises a metaphosphate-providing component and/or an orthophosphate-providing component.

A castable refractory composition comprises: a cement-free refractory particulate composition; and a sol binder; wherein the castable refractory composition comprises a metaphosphate-providing component and/or an orthophosphate-providing component.