CN102650008A

CN102650008A - Multi-element trace alloy casting new material used for producing cylinder cover of diesel engine and preparation method of multi-element trace alloy casting new material

Info

Publication number: CN102650008A
Application number: CN2011100434825A
Authority: CN
Inventors: 曾湘黔; 曾琦
Original assignee: GUIYANG HUAHENG MACHINERY PARTS CO Ltd
Current assignee: GUIYANG HUAHENG MACHINERY PARTS CO Ltd
Priority date: 2011-02-23
Filing date: 2011-02-23
Publication date: 2012-08-29

Abstract

The invention discloses a multi-element trace alloy casting new material used for producing a cylinder cover of a diesel engine and a preparation method of the multi-element trace alloy casting new material. The material comprises the following chemical elements: 0.3-0.7 percent of manganese, 0.3-0.6 percent of nickel, 0.1-0.3 percent of cobalt, 0.05-0.15 percent of copper, 0.05-0.15 percent of zirconium, 0.05-0.15 percent of titanium and the balance aluminum. The preparation method comprises a conventional protection process and is characterized in that when smelting is performed, an aluminum ingot is directly added to a smelting furnace for smelting; alloyed powder is directly added to discharged molten aluminum. The material disclosed by the invention is higher in corrosion resistance and heat resistance, is compact in tissue and even in component, and is especially suitable for producing the cylinder cover of the diesel engine.

Description

Be used to produce the polynary microalloy foundry goods novel material and the preparation method of diesel engine cylinder lid

One, technical field

The present invention relates to polynary microalloy casting material, especially for the polynary microalloy casting material of producing the diesel engine cylinder lid.

Two, background technology

Existing diesel engine cylinder lid general employing duraluminum AC4B (material mark) carries out gravitational casting and forms.What this aluminum alloy materials was the most frequently used is the Al-Si casting alloy, adopts age hardening or precipitation strength after the casting and the mechanical property that improves.But under the high temperature, the grain structure of this material is big, and component segregation makes aluminium alloy cylinder lid unstable properties to be easy to generate thermal fatigue, problems of crack occurs, can not satisfy the needs of mover.

Chinese patent CN10644203A discloses a kind of making method of aluminium casting alloy cylinder cap, and its chemical ingredients is 8%～10% Si by weight percentage; 2%～3% Cu, 0.15%～0.35% Mg is lower than 0.3% Mn; Fe less than 0.45%, all the other are Al.The material that this aluminium alloy cylinder lid adopts is on the basis of aluminum silicon alloy, through adding trace elements such as iron, copper, magnesium, to form more Mg2Si, Al3Mg2, CuAl2 etc., reaches the raising comprehensive mechanical performance.Aluminum alloy materials thermotolerance, the solidity to corrosion of using this method to produce are not high enough, organize densification inadequately, are difficult to satisfy the working condition requirement of present stage diesel motor.Therefore, it is very urgent to improve the performance of products quality through technological innovation.

Three, summary of the invention

The objective of the invention is to, a kind of new polynary microalloy foundry goods novel material and the preparation method that are used for the diesel engine cylinder lid are provided.Material of the present invention has higher solidity to corrosion and thermotolerance, and dense structure, composition are even.

Technical scheme of the present invention: be used for the polynary microalloy foundry goods novel material of production cylinder head, it is characterized in that, the consisting of of chemical element: manganese 0.3%～0.7%; Nickel 0.3%～0.6%; Cobalt 0.1%～0.3%, copper 0.05%～0.15%, zirconium 0.05%～0.15%; Titanium 0.05%～0.15%, remaining is aluminium.

Be used to produce the preparation method of the multiple microalloy foundry goods novel material of diesel engine cylinder lid, comprise conventional production process; It is characterized in that, during melting, adopt aluminium ingot directly to add and carry out melting in the melting furnace; Alloy powder directly adds in the aluminium liquid to be come out of the stove.

With prior art relatively, the present invention just with suitable element proportioning and working method, makes material of the present invention have solidity to corrosion, thermotolerance preferably, and characteristics such as dense structure, composition be even.The present invention is because several kinds of alloying elements below having adopted:

1. add Cu, can form the Al-Cu alloy, the CuAl2 that timeliness is separated out has tangible ageing strengthening effect;

2. add Mn, can stop the recrystallization process of duraluminum, improve recrystallization temperature, and can remarkable refinement recrystal grain.The refinement of recrystal grain mainly is to the recrystal grain inhibition of having grown up through MnAl6 compound dispersoid particle;

3. add Ni, can form many compound phases,, significantly increased the thermostability of comparatively high temps lower substrate and the heat resistance of material like AlCuNi, NiAl3 etc.;

4. add Zr, can form the ZrAl3 compound, can hinder recrystallization process, the refinement recrystal grain with aluminium;

5. add cobalt Co, thereby can strengthen this alloy mutually through reinforced aluminum;

6. add Ti, can form TiAl2 mutually with aluminium, the non-spontaneous core when becoming crystallization plays refinement cast structure;

The present invention adopts aluminium ingot directly to add and carries out melting in the melting furnace when melting.Polynary microalloy powder by rational proportion adopts the mode that adds fusing with the aluminium liquid of coming out of the stove, and not melting in stove makes burn out rate reduce, and has guaranteed the effective content of microalloy.

Four, embodiment

Below in conjunction with embodiment the present invention is done further detailed description, but not as the foundation of the present invention being done any restriction.

Embodiment:

Be used to produce the polynary microalloy foundry goods novel material of diesel engine cylinder lid, the consisting of of the chemical element of finished product: manganese 0.3%～0.7%, nickel 0.3%～0.6%; Cobalt 0.1%～0.3%, copper 0.05%～0.15%, zirconium 0.05%～0.15%; Titanium 0.05%～0.15%, remaining is aluminium.Production technique comprises conventional production process, suitable raw material ratio, melting furnace melting, pressure pouring moulding and mechanical workout; Different is: adopt aluminium ingot directly to add continuous smelting in the melting furnace; To add in the aluminium liquid of coming out of the stove by the polynary microalloy powder of proportioning again.Alloy powder adopts the mode that adds the fusing of aluminium liquid, and not melting in stove makes burn out rate reduce, and guarantees the effective content of microalloy.

Claims

1. a polynary microalloy foundry goods novel material and a preparation method who is used to produce the diesel engine cylinder head is characterized in that the mass percent of this each component of material: manganese 0.3%～0.7%; Nickel 0.3%～0.6%; Cobalt 0.1%～0.3%, copper 0.05%～0.15%, zirconium 0.05%～0.15%; Titanium 0.05%～0.15%, remaining is aluminium.

2. be used to produce the preparation method of the multiple microalloy foundry goods novel material of diesel engine cylinder lid according to claim 1, comprise conventional production process; It is characterized in that, during melting, adopt aluminium ingot directly to add and carry out melting in the melting furnace; Alloy powder directly adds in the aluminium liquid of coming out of the stove.