The solution for Pogo pin head hanging tin?

　　In terms of Pogopin's needle coating, most of the materials currently used are Au materials. The adhesion of Au to Sn is relatively strong. In order to solve the problem of the material characteristics, Pdco materials can be used instead of Au, and Pdco is also A precious metal, compared with gold, it has the following material properties.

　　(1) Hardness

　　The hardness of Pdco is 450HV

　　The hardness of Au is 200HV1

　　The surface hardness of Pdco is higher than that of Au, which makes Pdco have better wear resistance than Au.

　　(2) Friction

　　The friction coefficient of Pdco is .40

　　The friction coefficient of Au is .65

　　The lower coefficient of friction can help the needle move more smoothly in the tube wall

　　(3) Particle size

　　The size of Pdco is 50-150? Angstroms?

　　The particle size of Au is 200-250? Angstroms? Angstroms=0.0000000001 meters

　　Materials with small particles are more difficult to cause surface oxidation.

　　(4) Toughness

　　Pdco: 3-7%? elongation

　　Au: <3%? Elongation Stronger surface toughness Under the collision of the needle and the period of contact, the surface is less prone to cracks. From the above data, it can be seen that Pdco is superior to Au in terms of material properties. But all materials are not perfect. The most important aspect of resistance is that Au is higher than Pdco!

　　(5) Resistance (data obtained with the same number of times under the same needle, different plating test environment) Au19mΩ Pdco? 26mΩ If you encounter products that are more sensitive to impedance data, the test yield of Au is lower than that of Pdco.

　　In summary, aiming at the respective characteristics of Pdco and Au. At present, a new coating alloy 2-21 that combines the characteristics of the two materials has been developed. In terms of resistance, the data of alloy 2-2 is very close to the data of Au, and at the same time, it can obtain the same characteristics of tin-free as Pdco. In terms of material hardness Both are higher than Au and Pdco.

　　Comparison of hardness: Alloy2-2 has a hardness of 680HV8, Pdco? has a hardness of 450HV, and Au has a hardness of 200HV2. Alloy 2-2 is covered with 4 layers of gold on the basis of raw materials to achieve the required performance. Therefore, the new alloy 2-2 coating can be used to effectively improve the problem when the degree of tin hanging is relatively high.

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