Low melting point rare earth oxide reinforced composite leadless solder butter
A technology of rare earth oxide and lead-free solder, applied in the direction of welding medium, mixing method, welding equipment, etc., can solve the problems of increased cost, poor process performance of composite solder, affecting solder wettability, etc., and achieves simple process , Excellent tissue stability and high bonding strength
Inactive Publication Date: 2004-12-22
DALIAN UNIV OF TECH
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Problems solved by technology
These studies have made some progress, but there are still many problems: the process performance of the composite solder is poor; the addition of the reinforcement af
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[0015] The best embodiment of the present invention is described in detail below:
[0016] Put Y with a size of about 1 micron 2 O 3 The powder is added to the RMA flux, and it is stirred evenly by a mechanical mixing method. The Sn-58Bi powder and the above-mentioned flux containing rare earth oxide powder are mixed uniformly to obtain a composite solder paste. Y 2 O 3 The powder accounts for about 3% of the total solder paste weight. The composite solder paste can be used for reflow soldering.
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Abstract
A low-smelting-point RE oxide reinforced lead-free composite solder paste for soldering electronic elements is prepared through mixing RE oxide with solder, stirring, adding lead-free metallic powder, and mechanical mixing. Its advantages are excellent mechanical performance, electric conductivity and structure stability.
Description
technical field [0001] The invention belongs to the field of metal materials, relates to the technical field of soldering materials for electronic packaging, and in particular relates to a lead-free solder paste suitable for soldering electronic components and requiring high reliability packaging and a preparation process thereof. Background technique [0002] Traditional tin-lead (SnPb) solder has been used for thousands of years and has now become the main material for electronic package interconnection. However, lead and its compounds are highly toxic substances, which bring great harm to the living environment and safety of human beings. [0003] Constrained and driven by factors such as public opinion, environmental awareness, and market demand, lead-free electronic packaging has become a major scientific and technological frontier issue and a systematic engineering issue in academia and industry. Since the U.S. anti-lead bill HR-5374 (U.S. Congress), S-2637 and S-391 ...
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IPC IPC(8): B01F3/18B23K35/24C22C13/00
Inventor 王来于大全马海涛韩双起赵杰
Owner DALIAN UNIV OF TECH
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