SZFitech

 There are significant differences between BGA flux paste and ordinary flux paste, mainly in the following aspects: 1. Composition and Design Objectives BGA Flux Pastes: are usually designed based on the requirement for lead-free soldering, so they do not contain lead in their composition and usually have a higher melting point and a longer melting range for soldering BGA (Ball Grid Array) chips.In addition, BGA flux pastes typically have a higher viscosity to keep solder balls in the correct position and prevent them from slipping. General Flux Paste: May contain lead or other alloys for different soldering needs.General flux pastes typically have a lower melting point and shorter melting range, and may have a lower viscosity, making them more suitable for other soldering applications. 2. Performance Characteristics BGA Flux Paste: Wettability and Coverage: Since the solder balls on BGA chips are usually small, BGA flux paste usually has better wettability and cov...

 Mini-LED direct display technology adopts COB (Chip on Board) package, which can achieve high density, high contrast and high brightness display effect.In the COB packaging process, solder paste, as a key connecting material, plays a crucial role in soldering quality and reliability.The following is a detailed analysis of Mini-LED direct display COB package solder paste: 1. Features of Mini-LED direct display COB package High-density package: Mini-LED chip size is small, the number of chips per unit area is large, the packaging process is required to have high precision and high density. High reliability: COB package will be directly welded to the chip on the substrate, reducing the number of welding points and connecting wires, improving product reliability. High brightness and contrast: Through fine control of the light emission of each LED chip, it achieves high brightness and high contrast display effect. 2. the role of solder paste in COB packaging Connection: ...

 Void is the presence of air bubble in a solder joint, which affects the mechanical strength, thermal conductivity and electrical properties of the solder joint. Under the same PCB and device conditions, some soldering materials are prone to void formation, while some solder pastes exhibit excellent properties for controlling solder joint void. Flux changes during the soldering process is a very complex process involving a variety of physical and chemical changes, the flux formula determines the soldering effect and characteristics. During the welding process, the flux removes metal oxides from the weld end surface to generate water and gasification to form void; the organic acids in the flux esterify to generate water and gasification to form void; and the organic matter in the flux cracks to form void. Basic reaction principle (a) welding process flux to remove the weld end face metal oxide layer, generating metal salts and water. 2RCOOH+SnO=(RCOO)2Sn+H2O↑ 2HBr+CuO=Cu...

 Intermetallic compounds are a class of substances formed by chemical bonding of metallic elements in specific atomic proportions. In order to obtain a good welding result, a metallurgical reaction must take place between the solder component and the base metal component that creates a strong bond, i.e., an appropriate alloy layer (intermetallic compound, or IMC) at the interface. Therefore, in the welded joint interface, the formation of IMC or the formation of good or bad quality, the mechanical, chemical, electrical and other properties of the welded joint has a critical impact. Intermetallic compound formation conditions Solder joints serve two key purposes when joining two materials: good electrical conductivity and long-lasting mechanical joint strength. Sn-Pb solder, for example, when the two are connected to the base metal are Cu, to achieve a durable and strong mechanical connection, it must be heated to the solder joint temperature above the melting point of...

 A.the composition of the solder paste Solder paste is a key material in electronic soldering, mainly composed of the following three parts: 1. Tin powder, proportion: 80-90% Composition: The main component is tin (Sn), sometimes also contains lead (Pb), silver (Ag), copper (Cu), bismuth (Bi) and other metal elements, the specific proportion of welding needs and application scenarios to adjust. Characteristics: Melting point: determines the soldering temperature of the solder paste, and the melting point of tin powder of different compositions is different. Particle size: affects the printing performance and soldering effect, the smaller the particle, the higher the printing accuracy, but the risk of oxidation also increases. Solder joints performance: solder joints thermal conductivity and electrical conductivity is only based on the alloy composition of the tin powder in the solder paste, different alloy compositions, its electrical conductivity and thermal conductivi...