Method and powder mixture for repairing oxide based refractory bodies

A method of repairing an oxide-based refractory body by projecting a powder mixture against a hot surface of the body and in the presence of oxygen to provide a refractory repair mass, the method comprising:

• a. providing a powder mixture comprised of:
• from 80% to 95% by weight of refractory particles comprised of at least one refractory oxide;
• and
• from 5% to 20% by weight of fuel particles which react in an exothermic manner with oxygen to form a refractory oxide and which are particles selected from the group consisting of magnesium, aluminum, silicon, and mixtures thereof,
• wherein the refractory particles further comprise particles of silicon carbide in an amount which is effective to provide a reduced porosity of a refractory repair mass produced from the powder mixture and which ranges from at least 1% by weight but does not exceed 10% by weight based on the total weight of the powder mixture;
• and
• b. projecting the powder mixture against a hot surface of the oxide-based refractory body and in the presence of oxygen,
• wherein the oxide-based refractory body is selected from the group consisting of magnesium oxide-containing bodies.

A powder mixture for the repair of oxide-based refractory bodies, comprising:

• from 80% to 95% by weight of refractory particles comprised of at least one refractory oxide;
• and
• from 5% to 20% by weight of fuel particles which react in an exothermic manner with oxygen to form a refractory oxide and which are particles selected from the group consisting of magnesium, aluminum, silicon, and mixtures thereof,
• wherein the refractory particles further comprise particles of silicon carbide in an amount which is effective to provide a reduced porosity of a refractory repair mass produced from the powder mixture and which ranges from at least 1% by weight but does not exceed 10% by weight based on the total weight of the powder mixture.

A powder mixture for the repair of oxide-based refractory bodies, comprising:

• from 80% to 94% by weight of particles of at least one refractory oxide which are selected from the group consisting of alumina, magnesia, and mixtures thereof;
• from 5% to 15% by weight of fuel particles which react in an exothermic manner with oxygen to form a refractory oxide and which are particles comprised of at least one element selected from the group consisting of magnesium, aluminum, silicon, and mixtures thereof;
• and
• from 1% to 5% by weight of particles of silicon carbide.