P-si intermediate alloy and preparing method

An intermediate alloy, p-si technology, applied in the field of metal materials, can solve the problems of environmental pollution, high use cost, low phosphorus content, etc., and achieve the effect of improving mechanical and service performance, reducing production cost, and high phosphorus content

Inactive Publication Date: 2006-08-09
刘相法
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these methods all have many disadvantages: red phosphorus has a low ignition point (240°C), and a large amount of toxic P is released during deterioration treatment. 2 o 5 Gas, which seriously pollutes the environment; the metamorphic effect of phosphorus salt is unstable, and there are also environmental pollution problems during use; the phosphorus-copper master alloy has a high density and a high melting point, and it is easy to precipitate afte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) at first take raw material by the mass ratio of pure silicon 60%, red phosphorus 20%, pure nickel 20%;

[0015] (2) Alloying pure silicon and pure nickel in a high-temperature melting furnace and keeping it warm at 1550°C;

[0016] (3) Heat the red phosphorus to 450°C in a nitrogen-protected low-temperature holding furnace, keep the phosphorus vapor pressure in the furnace at 1 atmosphere, connect the phosphorus vapor to the bottom of the silicon-nickel-manganese alloy melt through the phosphorus pipe, and stir the alloy melt , to promote the dissolution of phosphorus in the melt;

[0017] (4) Cast directly into ingots.

[0018] A P-Si master alloy with an optimal composition is obtained according to the above proportioning ratio, and its chemical composition (mass percentage) is: 60 silicon, 20 phosphorus, and 20 nickel.

Embodiment 2

[0020] (1) at first take raw material by the mass ratio of pure silicon 65%, red phosphorus 20%, pure manganese 15%;

[0021] (2) Alloying pure silicon and pure manganese in the above-mentioned high-temperature smelting furnace, and keeping it warm at 1450°C;

[0022] (3) Red phosphorus is heated to 520 DEG C in the low-temperature holding furnace protected by argon, and the phosphorus vapor pressure in the furnace is kept at 1.5 atmospheres, and phosphorus is added to the silicon-manganese alloy melt by the method of Example 1;

[0023] (4) Atomized into powder by atomizer.

[0024] A P-Si master alloy with optimal composition is obtained according to the above proportioning ratio, and its chemical composition (mass percentage) is: silicon 65, phosphorus 20, manganese 15.

Embodiment 3

[0026] (1) at first take raw material by the mass ratio of pure silicon 40%, red phosphorus 25%, pure nickel 20%, pure manganese 15%;

[0027] (2) Alloying pure silicon, pure nickel and pure manganese in the above-mentioned high-temperature melting furnace, and keeping it warm at 1500°C;

[0028] (3) Red phosphorus is heated to 500 DEG C in the low-temperature holding furnace protected by argon, and the phosphorus vapor pressure in the furnace is kept at 1.25 atmospheres, and phosphorus is added to the silicon-nickel-manganese alloy melt by the method of Example 1;

[0029] (4) Pouring into ingots or atomizing powder.

[0030] A P-Si master alloy with optimal composition is obtained according to the above proportioning ratio, and its chemical composition (mass percentage) is: 40% silicon, 25% phosphorus, 20% nickel, and 15% manganese.

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Abstract

This invention relates to a P-Si intermediate alloy used in refining initial crystal silicons in Al-Si alloy and Mg2Si in Mg-Si alloy and its preparation method, in which, the chemical composition of said intermediate alloy is (wt%): Si 40.0-70.0, P 8.0-25.0 and Ni or Mn for the rest, the preparation steps include: melting pure Si, Ni or Mn raw material in a high temperature smelting furnace, heating red phosphor to 450-520deg.C in a low temperature heat preservation furnace protected by Ar or N2 then to connect the phosphor steam to the bottom of a Si alloy molten bath via a P transport pipe and mixing it to urge the phosphor to be dissolved in the bath then to be cast directly to ingot or atomized to powder.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a method for refining primary silicon in Al-Si alloys and Mg in Mg-Si alloys. 2 P-Si master alloy of Si and its preparation method. Background technique [0002] In industrial production, the method of adding phosphorus is generally used to refine the primary silicon in Al-Si alloy (also known as modification treatment), mainly in the form of red phosphorus, phosphorus salt or phosphorus-copper intermediate alloy. But these methods all have many disadvantages: red phosphorus has a low ignition point (240°C), and a large amount of toxic P is released during deterioration treatment. 2 o 5 Gas, which seriously pollutes the environment; the metamorphic effect of phosphorus salt is unstable, and there are also environmental pollution problems during use; the phosphorus-copper master alloy has a high density and a high melting point, and it is easy to precipitate after being added to t...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C19/00C22C22/00C22C1/03
Inventor 刘相法刘相俊刘相义
Owner 刘相法
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