PRODUCT CATEGORIES

Vacuum Heat Treatment Furnace

Vacuum Sintering Furnace

Vacuum Brazing Furnace

The solder material for vacuum brazing should be selected in this way

Except that the filler metal for vacuum brazing in a vacuum brazing furnace does not contain elements with high volatile vapor pressure, other requirements are the same as ordinary filler metal. Vacuum brazing in a vacuum brazing furnace mainly solves the problem of brazing high-temperature alloys.

Aluminum based solder

Aluminum alloy has been increasingly widely used in the aviation and aerospace industries due to its advantages of low density and high specific strength. For example, many traditional copper alloy waveguides and high-frequency devices have been replaced by aluminum alloys. The use of brazing methods to manufacture complex aluminum structures is the most ideal method. Eutectic aluminum-silicon solder is the most widely used aluminum solder in aluminum alloy brazing due to its good wettability, fluidity, corrosion resistance and processability of the brazed joint.

Silver based solder

Silver-based solder is an alloy solder mainly composed of silver or silver-based solid solution. It has the characteristics of low melting point, good wetting performance and gap filling performance, excellent strength, plasticity, conductivity, corrosion resistance and other properties. It can be used to braze almost all ferrous and non-ferrous metals except aluminum, magnesium and other low melting point metals. Added The active elements have excellent wettability to diamond, graphite and carbon, cubic boron nitride ceramic materials, etc., so they are widely used.

In order to improve the process performance or economy and environmental protection of solder, such as lowering the melting point, improving wettability, reducing silver content, etc., alloy elements such as zinc, tin, nickel, cadmium, indium and titanium are usually added to the solder to form three Yuan or multi-element alloy.

Copper-based solder

Copper-based solder is composed of copper as the matrix and added elements that can lower the melting point and improve its overall performance, such as phosphorus, silver, zinc, tin, manganese, nickel, cobalt, titanium, silicon, boron, iron, etc., mainly There are pure copper, copper-phosphorus, copper-tin, copper-zinc, copper-manganese and other series;

Copper-based solder is widely used in brazing of copper and copper alloys, carbon steel and cast iron, stainless steel, high-temperature alloys, cemented carbide, etc. It has good electrical and thermal conductivity, as well as good strength and corrosion resistance.

Nickel-based solder

Nickel-based solder is composed of nickel as the matrix and elements that can lower the melting point and improve its thermal strength, such as chromium, boron, silicon, phosphorus, etc., mainly including nickel-chromium-silicon-boron, nickel-silicon-boron, nickel-chromium-silicon, Nickel-phosphorus, nickel-chromium-phosphorus and other series;

Nickel-based brazing filler metal is widely used in brazing stainless steel, high-temperature alloys, iron-based alloys, iron-nickel-based alloys, diamonds, cemented carbide, C/C composite materials, etc. It has good high temperature resistance, corrosion resistance, and excellent Mechanical properties, etc. As a type of filler metal widely used in vacuum brazing, nickel-based filler metal is mainly used for brazing parts that work at high temperatures or in corrosive media.

Cobalt based solder

Cobalt has a high melting point. Both Co-Cr and Co-Ni can form solid solutions and have excellent comprehensive mechanical properties. Therefore, cobalt-based solder is usually based on Co-Cr-Ni and added with other elements. For example, adding silicon can lower the melting temperature. Adding tungsten can improve the high temperature performance of solder. In general, cobalt-based filler metal is particularly suitable for brazing cobalt-based alloys.

Titanium based solder

Titanium is an active metal with high specific strength and excellent corrosion resistance. The brazing material formed by adding elements such as zirconium, beryllium, manganese, cobalt, and chromium has strong oxidation resistance, excellent corrosion resistance, and good wetting properties. It is suitable for most metals. It can wet some non-metals and is widely used in vacuum brazing, diffusion brazing and sealing of titanium, titanium alloys, tungsten, molybdenum, tantalum, niobium, graphite, ceramics, gemstones and other materials.

Amorphous solder

Amorphous solder is a special form of solder developed through rapid cooling and quick quenching technology. Nickel-based solder and brittle solder such as copper-phosphorus, copper-titanium, and aluminum-silicon that could not be rolled before are spray-cast into foil shapes. , to meet the needs of flat joint brazing. At present, amorphous solder materials are available in five categories: nickel-based, copper-based, copper-phosphorus, aluminum-based, and tin-lead. They are used in plate-fin coolers, radiators, honeycomb structures, electronic devices, ceramics and Production fields such as vacuum brazing or resistance brazing of graphite.