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US 4,975,391 AGranted
Enamel frit composition for direct coating
AssigneeIkebukuro Horo Kogyo Co., Ltd.
InventorsTadao Shimizu, Yoshihiro Iizawa, Toshiyuki Kasajima
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Abstract
The present invention provides an enamel frit composition which comprises a component selected from the group consisting of SiO.sub.2, B.sub.2 O.sub.3, Al.sub.2 O.sub.3, CaO, MgO, Na.sub.2 O, K.sub.2 O, Li.sub.2 O, BaO, ZnO, TiO.sub.2 and ZrO.sub.2, and one or more lanthanoid elements of the atomic numbers of 58 to 60 and 62 to 71 and which enables direct coating without any ground coating.
Claims8
In a vitreous enamel frit composition for coating an iron or stainless steel substrate, said composition consisting essentially of:
- (a) at least one of SiO.sub.2, TiO.sub.2 and ZrO.sub.2
- (b) at least one of Na.sub.2 O, K.sub.2 O and Li.sub.2 O
- (c) at least one of CaO, BaO, MgO, ZnO, SbO and PbO and
- (d) at least one of B.sub.2 O.sub.3 and Al.sub.2 O.sub.3,
- the improvement which comprises including in said composition a lanthanoid oxide at 0.01-20 parts by weight per 100 parts by weight of said composition, whereby said composition when directly coated on the surface of said substrate and fired thereon promotes the formation of dendritic crystals at the interface of said coated composition and substrate, thereby improving adhesion of said fired composition to said substrate.
2 more elements
Dependencies are inferred from the claim text.