Coating processes – With pretreatment of the base – Etching – swelling – or dissolving out part of the base
Patent
1988-12-16
1991-03-26
Pianalto, Bernard
Coating processes
With pretreatment of the base
Etching, swelling, or dissolving out part of the base
427423, 427427, 427444, B05D 304
Patent
active
050028057
ABSTRACT:
In a process of dressing a refractory structure, a comburent gas stream carrying a mixture of particles is projected against the site to be dressed. The particle mixture comprises particles of one or more elements which is or are oxidizable to form one or more refractory oxides ("fuel particles") together with refractory oxide particles and the fuel particles are caused or allowed to burn during projection. The mixture further incorporates a fluxing agent, the fluxing action of which is such that under the heat released by combustion of the fuel particles, the refractory structure becomes softened to an extent such that the structure becomes dressed by removal or displacement of material thereof under the mechanical action of the impinging stream.
Suitable fuels include very fine particles of aluminum and/or silicon. Suitable fluxes include fluorides and compounds of metals other than those whose oxides are projected in the mixture, for example alkali metal compounds, especially salts selected from borate, sulphate, carbonate and phosphate.
REFERENCES:
patent: 3684560 (1972-08-01), Brichard et al.
patent: 4560591 (1985-12-01), Plumat et al.
patent: 4792468 (1988-12-01), Robyn et al.
Glaverbel
Pianalto Bernard
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