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High plasticity tin-based material for metal ornaments

A high-plasticity, tin-based technology, applied in the field of tin-based materials, can solve problems such as low alloy surface finish, poor processing formability, structure and composition segregation, etc., achieve high surface brightness, improve plasticity, and refine alloy grains Effect

Inactive Publication Date: 2005-07-27
ZHEJIANG NEOGLORY JEWELRY CO LTD +1
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Lead-tin alloys are prone to microstructure and composition segregation under low cooling rate solidification conditions, resulting in casting defects, low plasticity of the alloy, and low surface finish of the alloy
In order to improve the strength and hardness of the alloy material, a higher content of alloying element antimony is added to the tin-antimony alloy for metal jewelry, and there will be more dendrites in the tin-antimony alloy at a lower solidification rate. The plasticity of the alloy is reduced, and the processing formability is deteriorated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0009] The material composition contains (by weight) 6.5% Pb, 0.4% Bi, 0.2% Cu, 0.08% Ce, and the remainder Sn. The industrial pure tin, industrial pure lead, industrial pure bismuth, tin-copper master alloy and tin-rare earth master alloy are melted in an intermediate frequency induction furnace and cast into block ingots according to material composition. Then the alloy ingot is reheated and melted in a resistance furnace, and molded in a silica gel mold by centrifugal casting to process and produce various metal ornaments and handicraft products.

[0010] The as-cast elongation of the inventive tin-based material is 72%, the tensile strength is 46MPa, and the hardness is HB13.7. Table 1 shows the comparison of mechanical properties between the material of the present invention and cast lead-tin alloy and tin-antimony alloy.

[0011] Material

Tensile strength σ b (MPa)

Elongation δ(%)

Hardness HB

Materials of the invention

46

7...

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PUM

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Abstract

The invention is about a tin-base alloy material which is composed of 1-15% Pb, 0.2-0.9% Bi, 0.1-0.5% Cu, 0.03-0.12% Ca, Sn: the residua. For all kinds meduim-height decorations and crafts. The product has the good plasticity tensile strength and stiffness, also it doesn't have the heat check and is easy to solder and galvanizer.

Description

technical field [0001] The invention belongs to tin-based materials. Background technique [0002] At present, various metal ornaments and handicraft products are produced, and lead-tin alloy and tin-antimony alloy are widely used. Although the lead-tin alloy has a low melting point, good fluidity, and no tendency to hot cracking, its tensile strength and hardness are low. Lead-tin alloys are prone to microstructure and composition segregation under low cooling rate solidification conditions, resulting in casting defects, low plasticity of the alloy, and low surface finish of the alloy. In order to improve the strength and hardness of the alloy material, a higher content of alloying element antimony is added to the tin-antimony alloy for metal jewelry, and there will be more dendrites in the tin-antimony alloy at a lower solidification rate. As a result, the plasticity of the alloy is reduced and the processing formability is deteriorated. Contents of the invention [0...

Claims

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Application Information

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IPC IPC(8): C22C13/00
Inventor 周晓光涂江平陆晓忠杨友志陶新姚邬震泰
Owner ZHEJIANG NEOGLORY JEWELRY CO LTD
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