CN103131914A - High strength aluminum alloy material for processing silver-bearing coordination compound and preparation method thereof - Google Patents

Abstract

The invention discloses a high strength aluminum alloy material for processing silver-bearing coordination compound. The alloy comprises, by weight, 3.5-4.0% Cu, 0.2-0.3% Mn, 1.0-1.2% Mg, <=0.05% Cr, <=0.05% Ni, <=0.15% Zn, <=0.1% Ti, <=1.2% Si, and <=1.2% Fe. Alterant [Ag (NH3)2] C1 counts 0.05-0.1% of sum mass of furnace materials. The remaining components are A1 and unavoidable trace impurities. Compared with common aluminum alloy materials, the aluminum alloy material is higher in purity and comprehensive performance.

Description

A kind of high-strength aluminum alloy material that contains the silver complex processing and preparation method thereof

Technical field

The invention belongs to the aluminum alloy materials field, relate to a kind of high-strength aluminum alloy material that silver complex processes and preparation method thereof that contains.

Background technology

Metamorphism can greatly improve comprehensive mechanical performance and the chemical stability index of aluminium alloy, sometimes or even subversive.Can produce metamorphic material and be called alterant.

Nearly all alterant all concentrates on a kind of technique means at present: contain the master alloy of alterant element take aluminium as matrix production, then in when aluminium alloy smelting, master alloy being added melt.

This process has produced two in energy-conservation disadvantageous link: the founding link that 1. contains the master alloy of high density alterant element, often need very high temperature (＞1000 ℃, as Al-Ti-B, Al-RE, Al-Si, Al-Sc, Al-V, Al-Cr, Al-Mn, Al-Co, Al-Ni, Al-W, Al-Zr etc.); 2. add master alloy during aluminium alloy smelting, " dissolving " be " dilution " alterant element also, then casting.

Concerning aluminium alloy was produced, how said process had been equivalent to " melting-casting " link, and in master alloy, a large amount of aluminium only plays the effect that stores alterant element, and its energy that consumes is invalid fully.

In various aluminium intermediate alloy alterants, the most representative is Al-Ti-B wire rod and aluminium-rare-earth (RE) master alloy.Along with going deep into of research, increasing element is found to have metamorphism, has also just produced increasing master alloy.For aluminum alloy smelting factory, in order to be absorbed in the production of terminal alloy product, to there is no need special investment and build the master alloy production line, and would rather be from the market purchasing master alloy.So the factory of special production aluminium intermediate alloy has just been arranged, and formed industrial scale, whole world aluminium intermediate alloy industry reaches billions of units at present.

Simultaneously, the effective element in the aluminium intermediate alloy alterant is difficult to play one's part to the full.

Although the matrix of master alloy is also aluminium, when producing master alloy, the process of high-melting-point element, indissoluble solution element and aluminium generation alloying is very rambunctious: the scaling loss amount increase of the segregation of effective element, aluminium and sneaking into of a large amount of impurity, all can hardly be avoided.Limit the quantity of for impurity and require very strict high performance alloys production, often the impurity brought into of alterant just is enough to make Chemical Composition surpass limited field; Simultaneously, under microstate, a large amount of effective alterant elements of assembling still are in homojunction colony bulk state, (＜800 ℃) can't dissolve fully and melt at all at the temperature of molten aluminum, only have surface rete as thin as a wafer to play the part metamorphism owing to may producing alloying reaction with aluminium, all the other a large amount of state of aggregations are all just how to add how to exist, metamorphism thereby have a greatly reduced quality.

Summary of the invention

Technical problem to be solved by this invention is, for the defective of aluminum current alloy inoculant and metamorphic mechanism existence, with alterant [Ag (NH ₃) ₂] the efficient alterant of Cl conduct, join in alloy melt with protective gas in the fluidization mode, by discharging the alterant element Ag of atom or ionic condition with aluminium alloy melt generation chemical reaction or pyrolytic decomposition, produced simultaneously N or Cl, can absorb and remove the detrimental impurity such as H and O element in melt, reach the purpose that efficiently, evenly goes bad and purify melt, realize the grain refining of matrix and metal compound phase; And the replacement master alloy in aluminium alloy is produced, cut down the number of intermediate links, energy-saving and cost-reducing.

A kind of high-strength aluminum alloy material that silver complex is processed that contains of the present invention, in massfraction, this alloying constituent is Cu:3.5～4.0%, Mn:0.2～0.3%, Mg:1.0～1.2%, Cr :≤0.05%, Ni :≤0.05%, Zn :≤0.15%, Ti :≤0.1%, Si :≤1.2%, Fe :≤1.2%, alterant [Ag (NH ₃) ₂] Cl is 0.05～0.1% of furnace charge total mass, all the other are Al and inevitable trace impurity.

A kind of preparation method who contains the high-strength aluminum alloy material of silver complex processing comprises the steps:

Step 1: in above-mentioned element ratio scope, a selected group element and amino title complex alterant [Ag (NH ₃) ₂] the Cl ratio, then the alloy total amount of preparation as required, extrapolate the quality of every kind of required elemental metals, establishment alloy production allocation sheet, and get the raw materials ready by allocation sheet choosing foot;

Step 2: add aluminium ingot or molten aluminum liquid in smelting furnace, heating makes it to melt fully and insulation under 700～800 ℃; Melting process is completed in enclosed environment;

Step 3: first add the selected alloying element of step 1 by formula rate again, make it dissolve fully and melt, mixed melt is stirred;

Step 4: then above-mentioned alloy melt is carried out furnace refining; Add refining agent in alloy melt, and stir, the melt refining operates in enclosed environment;

Step 5: after the refining slagging-off, with protective gas nitrogen, melt is carried out the degasification operation, make simultaneously to contain silver complex alterant [Ag (NH ₃) ₂] Cl joins in alloy melt with protective gas nitrogen in the fluidization mode; Stir simultaneously, alterant and alloy melt are fully reacted; Alterant adds complete, continues to pass into protective gas nitrogen complete to the alterant reaction;

Step 6: standing, temperature adjustment to 700～800 ℃, aluminium alloy are toppled over and are come out of the stove, and enter subsequent processing.

The beneficial effect that the present invention reaches:

1, found a kind of new efficient alterant: amino title complex alterant [Ag (NH ₃) ₂] Cl, changed the metamorphic mechanism of conventional aluminum alloy inoculant.

2, contain silver complex alterant [Ag (NH ₃) ₂] Cl adds aluminium alloy melt with the protective gas fluidization, solved technologic great difficult problem.

3, not only improved the modification effect of aluminum alloy modifier, controlled for efficient in producing, high precision and created condition, and alterant [Ag (NH ₃) ₂] N that goes out of Cl molecular breakdown and Cl can absorb the harmful elements such as H, O in melt, purify melt, thereby the effect of alterant and scavenging agent is organically combined.

4, effectively refinement aluminum substrate crystal grain and the metallic compound crystal grain such as Fe, Si, having significantly improved pure aluminum alloy is intensity and unit elongation performance.

5, replace master alloy, make aluminium alloy manufacturing concern no longer be limited by the master alloy manufacturer, be conducive to create the intensive production line of " nearly moulding, short flow process ", energy-saving and cost-reducing, reduce comprehensive cost.

Concrete reaction equation is:

[Ag (NH ₃) ₂] Cl+e (high temperature) → Ag (atomic state)+6H (atomic state)+2N (atomic state)+Cl (atomic state)

Ag+Al (liquid) → α (Al) is solution → saturated solution → cooling → supersaturated solid solution altogether altogether

Ag+Al (saturated solution altogether) → Ag-Al (intermetallic compound)

H (atomic state)+H (molten aluminium) → H ₂(gas)

N (atomic state)+H (molten aluminium) → NH ₃(gas)

N (atomic state)+Al (liquid) → AlN (compound).

Embodiment

Step 1: by the selected group element of formula, by weight: this alloying constituent is Cu:3.5%, Mn:0.2%, Mg:1.0%, alterant [Ag (NH ₃) ₂] Cl is 0.1% of furnace charge total mass, all the other are Al and inevitable trace impurity, wherein inevitably trace impurity, Si and Fe are by the impurity that brings in raw material, and impurity content is: single≤0.05%, add up to≤0.15%, Si :≤1.2%, Fe :≤1.2%; The alloy total amount of preparation is 1000kg, and the weight of extrapolating every kind of required material is: Cu:35kg, Mn:2kg, Mg:10kg, [Ag (NH ₃) ₂] Cl:1kg, Al:952.0kg;

Step 2: first add aluminium ingot or molten aluminum liquid in smelting furnace, heating makes it to melt fully and insulation under 700～800 ℃; Melting process is completed in enclosed environment;

Step 3: first add the selected alloying element of step 1 by formula rate again, make it dissolve fully and melt, mixed melt is stirred;

Step 4: then above-mentioned alloy melt is carried out furnace refining; Add refining agent in alloy melt, and stir, the melt refining operates in enclosed environment;

Step 5: after the refining slagging-off, with protective gas nitrogen, melt is carried out the degasification operation, make simultaneously alterant [Ag (NH ₃) ₂] Cl joins in alloy melt with protective gas nitrogen in the fluidization mode; Stir simultaneously, alterant and alloy melt are fully reacted; Alterant adds complete, continues to pass into protective gas complete to the alterant reaction;

Step 6: standing, temperature adjustment to 700～800 ℃, aluminium alloy are toppled over and are come out of the stove, and enter subsequent processing.

Claims (2)

1. one kind contains the high-strength aluminum alloy material that silver complex is processed, it is characterized in that: in massfraction, this alloying constituent is Cu:3.5～4.0%, Mn:0.2～0.3%, Mg:1.0～1.2%, Cr :≤0.05%, Ni :≤0.05%, Zn :≤0.15%, Ti :≤0.1%, Si :≤1.2%, Fe :≤1.2%, alterant [Ag (NH ₃) ₂] Cl is 0.05～0.1% of furnace charge total mass, all the other are Al and inevitable trace impurity.

2. a kind of preparation method who contains the high-strength aluminum alloy material of silver complex processing as claimed in claim 1, is characterized in that: comprise the steps:

Step 1: in above-mentioned element ratio scope, select a group element and contain silver complex alterant [Ag (NH ₃) ₂] the Cl ratio, then the alloy total amount of preparation as required, extrapolate the quality of every kind of required elemental metals, establishment alloy production allocation sheet, and get the raw materials ready by allocation sheet choosing foot;

Step 2: add aluminium ingot or molten aluminum liquid in smelting furnace, heating makes it to melt fully and insulation under 700～800 ℃; Melting process is completed in enclosed environment;

Step 3: first add the selected alloying element of step 1 by formula rate again, make it dissolve fully and melt, mixed melt is stirred;

Step 4: then above-mentioned alloy melt is carried out furnace refining; Add refining agent in alloy melt, and stir, the melt refining operates in enclosed environment;

Step 5: after the refining slagging-off, with protective gas nitrogen, melt is carried out the degasification operation, make simultaneously to contain silver complex alterant [Ag (NH ₃) ₂] Cl joins in alloy melt with protective gas nitrogen in the fluidization mode; Stir simultaneously, alterant and alloy melt are fully reacted; Alterant adds complete, continues to pass into protective gas nitrogen complete to the alterant reaction;

Step 6: standing, temperature adjustment to 700～800 ℃, aluminium alloy are toppled over and are come out of the stove, and enter subsequent processing.