Process of forming a refractory mass and mixture of particles for forming such a mass

A process according to claim 7, wherein the projected mixture further contains particles comprising at least one element which is oxidisable to form a refractory oxide which further particles are of such a size or composition that particles of such element become occluded in the formed refractory mass.

A process of forming a coherent refractory mass on a surface, comprising:

• projecting against that surface, together with oxygen, a mixture of refractory particles and fuel which reacts in an exothermic manner with the projected oxygen to release sufficient heat to melt at least the surfaces of the refractory particles and thus form said refractory mass, characterised in that the projected mixture contains, as said fuel, finely divided particles of at least one element which is oxidisable to form a refractory oxide and in that the projected mixture also contains carbonaceous particles which are of such a size or composition that carbon particles become occluded in the formed refractory mass and which comprise particles composed of a core of carbonaceous material which is covered with a mantle of a material which inhibits oxidation of such core.

A process of forming a coherent refractory mass on a surface comprising:

• projecting against that surface, together with oxygen, a mixture of refractory particles and fuel which reacts in an exothermic manner with the projected oxygen to release sufficient heat to melt at least the surfaces of the refractory particles and thus form said refractory mass, characterised in that the projected mixture contains, as said fuel, finely divided particles of at least one element which is oxidisable to form a refractory oxide, and in that the projected mixture also contains carbonaceous particles which are of such a size or composition that carbon particles become occluded in the formed refractory mass, and in that the projected mixture further contains particles comprising at least one element which is oxidisable to form a refractory oxide, which further particles are of such a size or composition that particles of such element become occluded in the formed refractory mass and are composed of a core of at least one said element which is oxidisable to form a refractory oxide, which core is covered with a mantle of a material which inhibits oxidation of such core.