Y. V. Naidich, V. Zhuravlev, I. Gab, B. Kostyuk, V. Krasovskii, National Academy of Sciences of Ukraine, Kiev, Ukraine
Based on wettability and adhesion investigations new brazed alloy compositions and brazing technologies (liquid phase brazing and diffusion bonding) for joining of dissimilar materials (ceramics, sapphire, glass ceramics, metals) were elaborated and brazed joints of different construction and destination were manufactured.
Among them:
─ brazing technology for structural Si3N4 ceramics with high strength of joint (up to 800 MPa);
─ brazing alloys and technologies to join structural ZrO2 ceramics of composition ceramics/ceramics and ceramics/metal (joint strength is ~ 300 MPa);
─ design and technological regimes of making sapphire/metal, ceramic glass/metal and sapphire/ceramics units by method of diffusion bonding through aluminium, indium or platinum gaskets for using in different environment (in air or in vacuum); room temperature technology joining ceramic glass/aluminium and others for special units;
─ process of formation of active high wetting ability brazing alloys particularly with titanium high porosity foil for nonmetal materials joining;
─ technology of infra-red materials (fluorides, chalcogenides, germanium) joining to metals.
Brazed joints in dependence of design and application of units are characterized by high vacuum tightness, strength and wide temperature range of exploitation (from cryogenic temperatures up to 1500 oC).
Brazed and diffusion bonded units are used in electronics, optics, space, laser, cryogenic, vacuum technics, infra-red technics and in engineering industry.
Summary: Based on wettability and adhesion investigations new brazed alloy compositions and brazing technologies (liquid phase brazing and diffusion bonding) for joining of dissimilar materials (ceramics, sapphire, glass ceramics, metals) were elaborated and brazed joints of different construction and destination were manufactured.
