Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1993-06-09
1995-02-07
Green, Anthony
Stock material or miscellaneous articles
Composite
Of inorganic material
1062861, 1062864, 1062865, 428433, 428450, 428457, 428469, 428471, 428698, 428699, 502177, 502200, 502202, 502204, 502240, 502242, 502246, 502254, B32B 900, B32B 3300, B01J 2100
Patent
active
053874757
DESCRIPTION:
BRIEF SUMMARY
BRIEF DESCRIPTION OF RELATED ART
Self-cleaning cookers, ovens, fryers or grills have already been proposed; cf. for example DE-C-2 517 526, DE-B-1 817 529 and ETZ-B, 25 (1973) M 171-172.
However, the effect of the known catalytically self-cleaning enamel is in need of improvement at temperatures below 300.degree. C. Instead of complete degradation of organic substances, visually unattractive, coated surfaces are formed, or residual substances are stored in the pores, evaporate out on re-warming and precipitate on cooler parts, for example on viewing windows.
There is therefore a desire for greater catalytic effectiveness and increased service life of catalytically coated surfaces of cookers, ovens, fryers or grills or parts thereof, with cleaning at temperatures of about 250.degree. C. with as little residue as possible being particularly desired.
SUMMARY OF THE INVENTION
One object of the invention is achieved, in accordance with an embodiment, by a catalytic coating composition for surfaces of cookers, ovens, fryers or grills which contains oxides of at least one metal from the group consisting of cerium, sodium, potassium, calcium, manganese, nickel and cobalt.
According to a further embodiment of the invention, a catalytic coating composition for surfaces of cookers, ovens, fryers or grills is proposed which contains of cerium, sodium, potassium and calcium, and
Here and in the embodiment below, these optional silicates may be inorganic compounds of silicon with aluminum and/or phosphorus, for example aluminum silicates, or silicon aluminum phosphates, such as SiAlPO.sub.3.
According to a further embodiment of the invention, a catalytic coating composition for surfaces of cookers, ovens, fryers or grills is proposed which contains of cerium, sodium, potassium and calcium, and
DETAILED DESCRIPTION OF THE INVENTION
According to a specific embodiment of the invention, a catalytic coating composition for surfaces of cookers, ovens, fryers or grills is proposed which, in addition to consisting of cerium, sodium, potassium and calcium or consisting of cerium, sodium, potassium and calcium, of manganese, nickel and cobalt (i.e. said metals in oxidic form and not as silicate or aluminate).
According to a further specific embodiment of the invention, the above mentioned catalytic coating compositions may additionally contain an alkali metal compound and/or alkaline earth metal compound with tantalum oxide, niobium oxide and/or tin dioxide.
Said compounds have high Coulomb field strengths between cation and anion and increase the catalytic activity in the regions close to the surface, these compounds also being able to undergo sintering with the enamel surface at elevated temperatures without decomposition. The surface area is thus increased, since said compounds do not form chemical compounds with the enamel base substance at the temperatures used.
According to a further embodiment of the invention, a catalytic coating composition for surfaces of cookers, ovens, fryers or grills is proposed which contains at least one boride, carbide, silicide and/or nitride of at least one metal from the fourth, fifth and/or sixth subgroup of the Periodic Table.
The catalytic coating compositions according to the invention may be powders.
A further object of the invention is achieved by a process for the preparation of one of the above-described catalytic coating compositions containing sodium, potassium, calcium, manganese, nickel and/or cobalt, in which said metals are precipitated from aqueous solutions of their salts metals or dissolved or dispersed silicic acid and/or said metals or a dissolved or dispersed aluminum oxide, dried and powdered, and if desired mixed with highly porous silicate and/or base enamel.
Finally, a further object of the invention is achieved in accordance with an embodiment by cookers, ovens, fryers or grills or parts thereof having surfaces obtainable by composition according to the invention (containing base enamel powder) and sintering or melting the coating composition onto the surfaces,
REFERENCES:
patent: 2495837 (1950-01-01), Porter
patent: 3113200 (1963-12-01), Hurko
patent: 3460523 (1969-08-01), Stiles et al.
patent: 3547098 (1970-12-01), Lee
patent: 3576667 (1971-04-01), Lee
patent: 3598650 (1971-08-01), Lee
patent: 3718498 (1973-02-01), Denny et al.
patent: 4007251 (1977-02-01), Isaksson et al.
patent: 4282195 (1981-08-01), Hoekje
patent: 4515862 (1985-05-01), Maki et al.
Baresel Detlef
Janku Helmut
Scharner Peter
Bosch-Siemens Hausgeraete GmbH
Green Anthony
Robert & Bosch GmbH
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