CN1428443A - Zinc alterant - Google Patents

Abstract

The present invention discloses a zinc alterant for treating zinc and zinc alloy melt. It possesses two kinds of alterants, one of them is formed from (wt%) Al 20-40%, Ti 2-5%, B 0.5-1.5%, Xt 0.5-1% and Zn 55-75%; and another kind of formed from (wt%) Ti 2-4%, B 0.5-1.5%, Xt 0.5-1.5% and Zn 95-97%, in which the Xt is cerium system mixed rare earth. The application of said invented zinc alterant can make zinc and zinc alloy implement simultaneous uniform crystallizatino and form equiaxial fine grain tissue so as to obviously raise the service performance indexes of the product.

Description

Zinc alterant

Technical field

The present invention relates to be used for the alterant of zinc or zinc alloy melt treatment.

Background technology

Since the 1980s, China's zinc output grows steadily always, and the application of wherein particularly pot galvanize of zinc alloy, die case zinc and Battery Zinc just more and more widely.

It all is that the O zinc that provides with the smeltery is raw material that prior art is produced all kinds of zinc alloys, is equipped with and closes kind of an alloy ingredient, utilizes stirring and other methods involving to make uniform ingredients, is cast into the trade mark ZINC ALLOY that meets the composition requirement then.Various performance requriementss in ZINC ALLOY being satisfied use have generally used the low temperature casting to reduce the alloy inspiratory capacity in the production, adopt water-cooled to realize finer and closely woven weave construction.But the technology that this experience of applying mechanically gropes out still exists and fundamentally is difficult to the defective that overcomes, and the crystallization mode of its interalloy and crystalline-granular texture still affect the use properties of product.

Summary of the invention

The objective of the invention is, develop Zinc alterant, it is used for significantly improving its toughness and correlated performance index to zinc and zinc alloy melt treatment, thereby provides high-quality product.

One of technical scheme of the present invention is that the raw material weight per-cent of described Zinc alterant consists of:

Al 20-40％

Ti 2-5％

B 0.5-1.5％

Xt 0.5-1％

Zn 55-75％。

In the above-mentioned component, Xt is that cerium is a mishmetal; The each component total impurities should be controlled at less than 0. 8 percent (total impurities＜0.8%).The conventional reparation technology of this Zinc alterant is, behind the whole Al of fusing, allocates whole Ti, B, Xt into to evenly fusion, adds Zn then to all Zn fusings, stir, cast promptly.Tissue signature shows as alloy pig toughness.

Two of technical scheme of the present invention is that the raw material weight per-cent of described Zinc alterant consists of:

Ti 2-4％

B 0.5-1.5％

Xt 0.5-1.5％

Zn 94-97％。

In the above-mentioned component, Xt is that cerium is a mishmetal; The each component total impurities should be controlled at less than 0. 5 percent (total impurities＜0.5%).The conventional reparation technology of this Zinc alterant is, fusing Zn total amount about 90% after, allocate Ti, B, Xt into to evenly fusion, stir the back and add remaining about 10% Zn.Its tissue signature shows as alloy pig toughness.

The principle of design of Zinc alterant of the present invention is, the fine high temperature phase particle that generates in the alterant does not fuse under the zinc alloy melting temperature (Tm), high temperature is good with Zn coherence performance mutually simultaneously, therefore form intensive constitutional supercooling and crystallization nuclei after adding Zn water, it is simultaneously homogeneously crystallized that zinc and zinc alloy can be realized, thereby axle such as formation fine grain structure structure makes the relevant using property data of product effectively improve thus.

In zinc and zinc alloy melt treatment, zinc die casting alloys is after refinement and denaturation is handled, even melting casting under 550-600 ℃ high-temperature slightly, grain fineness number is also kept one-level (with reference to the aluminium alloy grain fineness number) and evenly whole, and air content reduces by one times; Be reflected on the performance index, the average unit elongation of test sample of ingot casting section itself increases and is twice, and reaches 4-5, and the fracture toughness property index improves three times, reaches 20-25J/mm ²And the plastisied dispersion of statistic data is less; Be reflected on the die-cast product, unit elongation reaches 9-12, and fracture toughness property on average reaches 40J/mm ²And the intensity of alloy pig sample is under the prerequisite that does not influence unit elongation, fracture toughness property index, with the raising of alterant add-on, when add-on is 1kg/ _{The T alloy}In the time, the highlyest record to such an extent that data are 302kg/mm ²

As known from the above, the present invention is a Zinc alterant, is used for zinc and zinc alloy melt treatment, can significantly improve the fracture toughness property and the correlated performance index of alloy, thereby can satisfy high-quality zinc and the zinc alloy product that use properties requires for the user produces.

Specific embodiments

Embodiment 1: get feed composition: Al35%, Ti3%, B1%, Xt1% by weight percentage, surplus is Zn, and total impurities＜0.8% makes by described technology.

Embodiment 2: get feed composition: Ti3%, B1%, Xt1% by weight percentage, surplus is Zn, makes by aforementioned reparation technology.

Claims (2)

1, a kind of Zinc alterant is characterized in that, its raw material weight per-cent consists of:

Al 20-40％，

Ti 2-5％，

B 0.5-1.5％，

Xt 0.5-1％，

Zn 55-75％；

Wherein, Xt is that cerium is a mishmetal.

2. a Zinc alterant is characterized in that, its raw material weight per-cent consists of:

Ti 2-4％

B 0.5-1.5％

Xt 0.5-1.5％

Zn 94-97％。

Wherein, Xt is that cerium is a mishmetal.