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Material characterization and application of AgCuTi active brazing material
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AgCuTi is a silver-based ternary active brazing alloy containing copper and titanium, commonly used components are AgCu34.5Ti1.5, AgCu26.5Ti3 and AgCul0Ti4, etc., their melting points in order of 770 ~ 810 ° C, 780 ~ 805 ° C and 771 ~ 825 C. AgCuTi alloys are equiaxial crystalline organization, intermetallic compounds into the particulate and massive distribution, with suitable solid/liquid phase line temperature, excellent wettability, and high brazing node strength and other properties, is the ideal brazing material to connect metals with many traditional ceramic and carbon materials. AgCuTi alloy material has suitable solid/liquid phase line temperature, excellent wettability, and high brazing node strength, etc. It is an ideal brazing material for connecting metal with many ceramics and carbon materials, and solves many traditional brazing problems, and utilizes the wettability principle of Ag-Cu-Ti activated metal filler in the field of ceramics joining to effectively improve the problem of residual stresses caused by the large difference in coefficients of thermal expansion between ceramics and metal brazing. The active brazing material has simplified the process flow. Activated brazing material simplifies the process, improves product quality, and its material properties make it widely used in many fields.
I. Material properties
The material properties of silver-copper-titanium active brazing material include the following aspects:
1, excellent wettability: AgCuTi alloy has excellent wettability, which makes it in the ceramics and ceramics, metal and ceramics and carbon materials brazing connection between the outstanding performance, wettability directly affects the quality and reliability of brazing joints. Experiments have shown that AgCuTi in Cu, TA1, TC4 and other different substrates show excellent wettability and spreading.
2, good corrosion resistance: experiments have proved that titanium can improve the comprehensive mechanical properties of silver-copper alloy, add titanium alloy has a better resistance to seawater corrosion, the material can be promoted to use as a nautical vessel instrument node material.
3, high wear resistance: silver-copper-titanium alloy metal parts of the compound distribution is uniform, the presence of Ti can refine the silver-copper alloy grain, grain boundaries increase, play a role in strengthening the alloy, so that the alloy's hardness and strength to improve the wear resistance of the material.
4, good electrical and thermal conductivity: AgCuTi brazing material brazing process can quickly transfer heat, and can achieve good current conduction, this characteristic makes silver-copper-titanium brazing material in the assembly and manufacture of electronic devices are widely used.
5, high adaptability: silver-copper-titanium solder is suitable for a variety of materials and composite ceramics and active metal connection, including ceramic-ceramic, ceramic-metal and metal-metal combination.
6, good processability: AgCuTi solder can be prepared into strips by rolling, rapid cooling and other methods, can also be manufactured into alloy powder or solder paste, convenient for different types of welding applications.
Second, the field of application
1、Electronic device field
AgCuTi active brazing material is one of the commonly used AMB active solder, with good wettability, can wet oxide, carbide, nitride and carbon matrix, widely used in IGBT, can to a certain extent, effectively solve the heat dissipation problem of IGBT high-power semiconductor devices. At present, the technology is not only in the automotive field, but also in the aerospace, rail transportation, industrial power grid field is widely used.
2, electrical manufacturing field
AgCuTi active brazing material in the medium load or heavy load electrical appliances to do electrical contact materials, electrical and thermal conductivity characteristics so that it can effectively withstand high currents and high temperatures in electrical equipment, thus ensuring the stability and reliability of the electrical contact. Widely used in HVAC and refrigeration system welding materials.
3、Medical field
Active brazing alloys are widely used in the medical industry in small and fragile parts of the connection, medical equipment in the design, molding and manufacturing process must ensure the accuracy of the assembly of precision medical equipment through brazing, for example, the need to connect different materials, surgical instruments, dental drills, X-ray equipment and so on.
4、Aerospace field
Active metal brazing is not only efficient, but also can form a strong sealing effect, can withstand high operating temperatures.AgCuTi active brazing material can be used for brazing aerospace and industrial turbine engine nozzles, engine sensor components and new turbine blade systems.
Ceramic-to-metal connections have potential applications in microelectronic packaging, metal-ceramic seals, vacuum tubes, sapphire-metal windows, etc. The material properties of AgCuTi activated brazing materials not only satisfy the demand for high-quality joining materials in a variety of industries, but also provide a strong support for future technological innovation. With the deepening of the research and the continuous progress of technology, AgCuTi active brazing material will surely play an important role in more fields and promote the rapid development of related industries.
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