SZFitech

  Metal segregation is a common phenomenon in the welding process, which refers to the inhomogeneous chemical composition distribution in the metal alloy. Some scholars have studied the influence of interface microstructure in crack growth, pointed out that the growth rate of fatigue cracks along the solder interface is related to the stress released with the aging time. In a long period of high-temperature aging, such as aging at 140 ° C 7 ~ 30 days, due to the Sn in the solder near the interface with the base metal Cu metallurgical reaction to form CuSn intermetallic compounds in the process of consuming Sn, and thus in the immediate vicinity of the interface of the IMC to form a continuous Pb-rich phase region and cause Pb segregation, as shown in Figure. Figure 1. Pb segregation Sequestration affects the reliability and performance of solder joints in the following ways. Impact on solder joint mechanical properties Metal segregation results in inhomogene...

  In the field of high-temperature soldering, the selection of solder directly impacts both soldering quality and equipment reliability. As industrial manufacturing evolves toward higher precision and greater temperature resistance, the demand for high-temperature solder continues to grow. Renowned high-temperature solder brands from both domestic and international markets. I. Internationally Renowned High-Temperature Solder Brands Sweden Hoganas Höganäs : The high-temperature solder business is concentrated in “BrazeLet®” Series Brazing Powder/Solder Paste，Primarily designed for vacuum or inert atmosphere brazing above 1000 °C. The product portfolio includes nickel-based and iron-based powders and solder pastes with melting points ranging from 980 to 1100°C. These products support spray application, screen printing, and roller coating, and are used in automotive EGR coolers, stainless steel oil coolers, brazed plate heat exchangers (BPHE), metal catalytic conv...

  In the field of metallic materials, the definition of "pure" often varies depending on the application scenario. For tin, the widespread acceptance of 97% purity as "pure tin" stems both from the industry's balancing act between performance and cost, and is inextricably linked to technical practices in high-end manufacturing. As a global leader in microelectronics and semiconductor packaging materials, Fitech's technological breakthroughs and product applications vividly illustrate this standard. 1. Industry Practice: Purity Standards Originate from Application Requirements In the metals industry, "pure" typically refers to commercial purity rather than absolute purity. For instance, international standards or industry specifications may define alloys with ≥97% tin content as "pure tin" to meet the minimum requirements for foundational applications like soldering and plating. This standard aligns closely with practices...