The specific application of brazing materials and related contents of brazing process

With the increase in magnesium as a manufacturing material, brazing technology of brazing materials has also developed accordingly. AZ91A and AZ31 are used as matrix materials. According to the test results of the diffused flow experiment, Mg-Zn alloy can be used as brazing solder, and different metal foils are used as consumable materials for point brazing tests. Research shows that brazed AZ91A material can be connected with Mg-Zn brazed solder. For point brazing, aluminum foil is a more suitable consumable material. 

Because the thermal input of welding is selectable, new ways to apply laser beam brazing in the electronics industry to packaged ceramic glass shells. Brazing tests conducted on the alumina matrix material, on the flat window glass of D263 window glass (borosilicate glass) and on the two flat window glasses with glass brazing materials with equivalent expansion coefficients showed that the brazing joints had no cracks, low porosity, good sealing, and no leakage of helium. 

In order to braze alumina and metals, palladium-based high-temperature brazing alloys have also been developed. In addition to its high melting temperature (1555°C) and oxidation resistance, palladium can form crystals with many elements, which makes it possible to develop solder materials as needed, and chromium, vanadium, titanium and yttrium can be added as alloy elements. During the brazing of alumina (Al300 contains 97.6% Al2O3 and adding CaO and SiO2 as metallurgical powder; Al997 contains 99.7% Al2O3), the wetting characteristics and brazing characteristics of palladium brazing alloy were experimentally studied. To this end, not only are Pd-6Cr, Pd-10Cr and Pd-6V brazed alloys used to make metal foils, but also pure palladium, titanium, yttrium, vanadium and chromium brazed alloys used to make metal foils.  

The temperature when the crystal begins to melt is called the melting point. The substance has crystals and amorphous, and the crystals have melting points, while the non-crystals have no melting points. The melting point of the crystal is different depending on the type. Generally speaking, the melting point of the crystal is from high to low, atomic crystal > ionic crystal > metal crystal > molecular crystal. There are more special ones in molecular crystals, such as water, ammonia, etc. Their molecules do not conform to the law of "regular changes in melting points of hydrides of elements of the same main group" because they contain hydrogen bonds.