Abstract: A housing for a microwave circuit is formed from a base made of metal matrix composite material and walls made of sheet metal. The base and the walls are joined together by diffusion soldering. Some holes to receive feedthroughs are formed at the junction of the base and a wall.

Abstract: A weld metal deposit which is not subject to solidification cracks and which is highly wear-resistant, also to the hot wear to which hot forming tools are subjected is disclosed. The weld metal deposit consists essentially of an air-hardening alloy steel containing 0.55% to 2.0% carbon, 0.2% to 4.0% silicon, 0.2% to 3.0% manganese, 4.0% to 6.5% chromium, 2.5% to 15.0% columbium, 0% to 3.5% strong carbide formers other than columbium, 0% to 0.5% nickel, and the remainder iron with or without incidental impurities. The contents of carbon and columbium have to be in a ratio of one to another as defined by the area indicated in FIG. 1 of the accompanying drawings.

Abstract: A glazed ceramic article in which the glaze includes titanium dioxide at least some of which is in the form of a metal titanate or a metal titano silicate and having a gloss of from 9 to 55 units at 45.degree. illumination. Also a glazing composition is described prepared by a semi-fritting technique in which the composition includes a mixture of a finely divided frit and an unfritted crystalline silica with the titanium dioxide being included in the frit together with alumina and a source of strontium, calcium or magnesium.