Abstract: Reinforcing glass yarn, the composition of which comprises the following constituents, within the limits defined below, expressed in percentages by weight: SiO2 54.5 to 58% Al2O3 12 to 15.5% SiO2 + Al2O3 70 to 73% CaO 17 to 25% MgO 0 to 5% RO = CaO + MgO 21 to 28% R2O = Na2O + K2O + Li2O up to 2% TiO2 less than 1% Fe2O3 less than 0.5% B2O3 up to 3% F2 less than 1% and such that the ratio R1=Al2O3/CaO is less than 0.7, and when SiO2 is greater than 57% the amount of boron oxide B2O3 is greater than 2%.

Abstract: The present invention relates to reinforcing glass yarns, the composition of which comprises the following constituents within the limits defined hereinbelow, expressed in percentages by weight:______________________________________ SiO.sub.2 58 to 62% Al.sub.2 O.sub.3 10 to 16% CaO more than 18% MgO more than 1.5% CaO + MgO less than 28% Na.sub.2 O + K.sub.2 O + Li.sub.2 O less than 2% TiO.sub.2 less than 1.5% Fe.sub.2 O.sub.3 less than 0.5% B.sub.2 O.sub.3 less than 2% F.sub.2 less than 2% ______________________________________this composition furthermore comprising less than 1% of other constituent(s) and comprising more than 0.5% of at least one of the three components F.sub.2, B.sub.2 O.sub.3 and Li.sub.2 O.These yarns have a composition providing an excellent compromise between its cost and its fiberizability.

Abstract: This invention relates to glass compositions intended for forming a substrate used in the production of electronic equipment. The glasses according to this invention comprise the following constituents within the limits expressed below in cation percentages:______________________________________ SiO.sub.2 + B.sub.2 O.sub.3 57 to 67% with B.sub.2 O.sub.3 5 to 20% Al.sub.2 O.sub.3 14 to 18% RO (CaO + MgO + BaO + SrO) 18 to 25% where Cao/Ro .gtoreq. 0.7 and CaO .gtoreq. 18% Na.sub.2 O + K.sub.2 O 0 to 0.5% TiO.sub.2 0 to 2.5% Fe.sub.2 O.sub.3 .ltoreq.0.5% F.sub.2 0 to 3% ______________________________________F.sub.2 being regarded as a cation.

Abstract: An apparatus for rapidly quenching a metal or alloy in the molten state by projecting a jet thereof from a crucible 7 onto a cooled belt 1 moving at high speed inside a vacuum chamber 3. The crucible is mounted outside of and above the chamber, with its curved bottom, provided with a casting orifice 14, resting on the rim 5' of an opening provided in the upper cover 6 of the chamber.

Abstract: A method of rapidly solidifying thin metallic strips, comprising projecting a jet of molten metal or alloy under reduced atmospheric pressure onto a cold substrate moving at high speed, thereby forming the strip in contact with the substrate, and then bringing the strip rapidly into higher atmospheric pressure. Forming the strip on the substrate under reduced atmospheric pressure improves the quality of the edges and surface of the strip, while bringing the strip rapidly into higher atmospheric pressure improves the adherence of the strip to the substrate. If the strip is brought into higher atmospheric pressure before its temperature falls to the temperature of vitrification, the properties of the vitreous metal formed, including its ductility, are also improved, because of the more rapid passage through the temperature range above the vitrification temperature than if the metal were cooled under reduced pressure.

Abstract: A thin strip of metal or alloy is subjected to rapid solidification as it is ejected under pressure in a molten state from a crucible onto a cold, continuous band moving at high speed beneath the crucible's opening, in order to form metal strips in the vitreous state. An atmosphere under reduced pressure surrounding the zone of impact of the molten metal on the band is provided by a partially evacuated housing having opposed narrow inlet and outlet openings through which the band passes. The band is cooled and precisely positioned, and its vibration is minimized, by ejecting fluid from openings in the bottom of the housing, over which the band passes in closely parallel fashion. A pressurized gas at low temperature, ejected through these openings in the direction of the band, creates a fluid cushion between the band and the bottom of the housing.