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What are the effects of alloying elements and impurities on

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What are the effects of alloying elements and impurities on

Release date:2019-09-23 16:21 source:Original click:

 Every copper casting we need does not want any flaws, so we should try to avoid these flaws, and how to avoid that, we must first understand the impact of its material.

  (1) Phosphorus can improve the technological and mechanical properties of tin bronze. Tin-phosphorus bronze is widely used as elastic material. The solubility of phosphorus in the solid solution of tin bronze is not large, and decreases with the increase of tin content and the decrease of temperature. Tin-phosphorus bronze containing phosphorus more than 0.5 occurs peritectic reaction at 637 C during solidification, so the hot-working temperature of this bronze should not exceed 637 C, otherwise it will produce hot brittleness. Therefore, the content of phosphorus in tin-phosphorus bronze should not be greater than 0.5. Phosphorus is a good deoxidizer for copper alloys, which can increase the fluidity of tin bronze, but increase the degree of reverse segregation.

  _Zinc and zinc are common additives to tin bronze. Zinc can dissolve in a large amount in the solid solution of copper-tin alloy. Zinc-containing processed tin bronze has single-phase solid solution structure. Zinc has no obvious effect on the structure and mechanical properties of tin bronze, but it can improve the fluidity of the alloy, reduce the range of crystallization temperature and reduce the reverse segregation of tin bronze.

  (3) Lead and lead do not dissolve in tin bronze. They exist in a single phase and are distributed among dendrites as black inclusions. Their distribution is not uniform. Nickel can improve the distribution of lead and refine the structure. Lead reduces the friction coefficient of tin bronze and improves the wear resistance and cutting type of the alloy.

_Nickel can dissolve a certain amount of nickel in the solid solution of alloys with tin content less than 8. If the nickel content is increased, new brittle phases will appear in the alloys and the plasticity will be reduced, which is the deterioration of the plasticity processing performance.

  _Manganese and manganese reduce the solubility of tin in solid solution. Tin bronze with proper manganese content can improve its strength and hardness by solution treatment and aging.

  _A small amount of iron can refine the grain size of tin bronze, significantly retard recrystallization, and improve strength and hardness.

  _Ti-Ti and Sn form TiSn compounds which are soluble in copper, and the amount of TiSn compounds increases with the increase of Ti content.

  _Beryllium and tin form intermetallic compound, which makes the copper-tin-beryllium alloy have obvious precipitation hardening phenomenon.

  _Zirconium, niobium, boron trace zirconium, niobium and boron can improve the mechanical properties and cold and hot plastic processing properties of tin bronze.

  _A small amount of Al, Mg and Si can be incorporated into the solid solution of copper-tin alloy to improve the mechanical properties of the alloy. But they are easy to oxidize to produce refractory oxides during casting, which reduces the fluidity and strength of tin bronze.

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