Wetting of quartz glass by low-temperature brazing melts

Abstract

The wetting a quartz glass in vacuum 2·10^-3 Pa and in temperature interval 400––600 °C is investigated. The sessile drop method with use of capillary clearing metal melt during experience is applied. As a liquid phase the pure metals indium, tin, lead and their alloys ПОС (Pb––30% (mass) Sn), ПСр-3 (Pb––3% (mass) Ag), Pb––25% (mass) In are used. Metal meltss do not wet the quartz glass surface — contact angle more 9 0°. The titanium up to 5% (mass) in alloys for improvement of wetting is added. Wetting angle at temperature 550 ° С and of 20 min process time, accordingly, for In — 11°, Pb — 7°, Sn — 37° (60 min), Pb––Ag — 9°, Pb––Sn — 28°, Pb––In — 12° was equal. The carried out researches have allowed to choose compound of brazes and to receive modes of the brazing of the quartz glass with aluminum.