Ngk Insulators, Inc.

Akira Ohmura

Noboru Yamamoto

Shigetaka Wada

Tadashi Nakano

A porcelain enamel frit for sheet iron ground coat is disclosed, which contains neither fluorine nor fluorine compound, but has excellent firing property, and can be worked into sheet iron enamel having high gloss and adherence and low surface roughness. The frit consists of 100 parts of a main component and 7-42 parts of an auxiliary component, said main component consisting of 30-73 parts of SiO.sub.2 or a mixture of SiO.sub.2 and at least one of TiO.sub.2, ZrO.sub.2 and SnO.sub.2, 8-45 parts of B.sub.2 O.sub.3, and 8-41 parts of Na.sub.2 O or a mixture of Na.sub.2 O and at least one of Li.sub.2 O and K.sub.2 O, and said auxiliary component consisting of not more than 12 parts of Al.sub.2 O.sub.3, 1-22 parts of at least one of CaO, Bao, ZnO, MgO and SrO, from more than 0 part to 7 parts of MoO.sub.3 or a mixture of MoO.sub.3 and at least one of V.sub.2 O.sub.5, P.sub.2 O.sub.5 and Sb.sub.2 O.sub.3, and 0.5-10 parts of at least one of CoO, NiO, CuO, MnO.sub.2 and Fe.sub.2 O.sub.3.

Porcelain enamel frit for sheet iron ground coat

A thermal converter is constructed with thermoelectric element composed of a honeycomb structural body having a large number of parallel channels extending therethrough and separated by thin walls, a part of the channels forming a region for flowing a high temperature fluid and the other part of the channels forming a region for flowing a low temperature fluid. A honeycomb structural body to constitute P type thermoelectric element and a honeycomb structural body to constitute N type thermoelectric element are preferably alternately arranged in a plurality of numbers.

Thermal converter

Heating elements comprising a ceramic article of a honeycomb structure having a positive temperature coefficient of electric resistance and composed of barium titanate are provided with channels, in which a pair of ohmic electrodes consisting mainly of silver as a metallic component and having a surface resistivity of the electrode per se of not more than 10 m.OMEGA./cm.sup.2 are provided on both end surfaces thereof and the ohmic electrodes are coated with an electrical insulating and thermostable material.

Growing community of inventors

Kasugai, Japan

Akira Ohmura