CN103305717A - Fusion casting method for preparing precise AuNiFeZr resistance alloy - Google Patents
Fusion casting method for preparing precise AuNiFeZr resistance alloy Download PDFInfo
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- CN103305717A CN103305717A CN2013101940842A CN201310194084A CN103305717A CN 103305717 A CN103305717 A CN 103305717A CN 2013101940842 A CN2013101940842 A CN 2013101940842A CN 201310194084 A CN201310194084 A CN 201310194084A CN 103305717 A CN103305717 A CN 103305717A
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Abstract
The invention belongs to the technical field of casting and relates to a fusion casting method for preparing a precise AuNiFeZr resistance alloy. By vacuum rules which are set in the method, material volatilization during Au smelting is alleviated; and baking rules which are set for furnace burden is beneficial to removal of gas out of the furnace burden. Material smelting with low power of 12-15kW is beneficial to further removal of gas out of the furnace burden. Au volatilization is further alleviated by means of charging Ar, adding Zr and reducing Zr oxidization during a later smelting period; besides, a high yield is achieved; the utilization efficiency of materials is enhanced. According to alloy pouring rules, the temperature is increased to 1,010-1,060 DEG C after Zr adding and stirring; at a pouring speed of 2-3kg/min, an alloy liquid is slowly and electrically poured into an investment casting shell or an ingot mould which is baked; selected slow pouring is beneficial to reduction of a shrinkage cavity as well as grain refinement. Proven in practice, the yield of AuNiFeZr wires can be increased to over 60% and material loss can be lowered by 15%-25%, by virtue of the method.
Description
Technical field
The invention belongs to casting technology field, relate to a kind of casting method of the AuNiFeZr of preparation precision electrical resistance alloy.
Background technology
AuNiFeZr alloy winding bare wire has good physicals, mainly for the manufacture of precision resistor and resistor, has widespread use at the aerospace accurate device.The difficult control of the content that but this alloy ingredient is many, melting is difficult, Zr content is low and easy loss causes Zr during melting, alloy bar material is rolling and silk material difficulty of processing is large, cause thus the yield rate of AuNiFeZr alloy winding bare wire the finished product always lower, present domestic AuNiFeZr alloy winding bare wire product on average only has about 40% to last finished product from melting.
The casting quality of evidence AuNiFeZr is very close with the lumber recovery relation of filum terminale section product, and the casting flaw of AuNiFeZr ingot casting or foundry goods is few, the tiny filum terminale section product lumber recovery of crystal grain is high.
Present AuNiFeZr alloy adopts non-vacuum melting mostly, because Zr content is had relatively high expectations, and can cause the oxidation of Zr during alloy melting, easily cause on the one hand the inclusion in the alloy liquid to increase, make material at follow-up rolling, drawing process cracking, easily make on the other hand the Zr content overproof.
Summary of the invention
The objective of the invention is to propose a kind of material follow-up rolling, drawing process is not easy to crack, the casting method of the preparation AuNiFeZr precision electrical resistance alloy that Zr content is difficult for exceeding standard.Technical solution of the present invention is: ready investment casting shell or ingot mould are put into vacuum chamber, 30% of Au total amount in the AuNiFeZr alloy is put into crucible, in crucible, put into successively afterwards whole Ni, Fe, put at last remaining Au, Zr whole in the alloy is put into the feeder of vacuum induction furnace, after the vacuum induction furnace vacuum chamber is evacuated to 5～15Pa, the melting power of vacuum induction furnace rises to 5kW, the furnace charge of putting into crucible is carried out the baking of 2～3min, melting power with vacuum induction furnace after the baking rises to 12～15kW melt, after metal charge all melts clearly in crucible, after refining 3～4min makes the abundant alloying of furnace charge, the vacuum induction melting power is down to zero, with the molten alloy conjunctiva in the crucible, close afterwards vacuum valve, vacuum-pump power supply is disconnected, be filled with the Ar of 0.04-0.06MPa pressure in the vacuum chamber of vacuum induction furnace, again Zr whole in the feeder is added crucible, the melting power of vacuum induction furnace is risen to 12～15kW, behind alloy melting, stir 2～5min, after the stirring, after alloy temperature in the crucible transferred to 1010～1060 ℃, after the vacuum induction melting power transferred to 5-8kW, with the pouring speed of 2～3kg/min, with slow charged being poured in the investment casting shell or cast iron mold of baking of alloy liquid.
The advantage that the present invention has and beneficial effect, the formulation of the present invention by the vacuum system, the material volatilization when having reduced the Au melting, the formulation of the baking regime by furnace charge is conducive to the removal of gas in the furnace charge.By the lower-wattage melt of 12～15kW, be conducive to the further removal of gas in the furnace charge.By filling Ar in the melting later stage, add Zr, reduce the oxidation of Zr, further reduce the volatilization of Au, and obtain higher recovery rate, improved the utilising efficiency of material.Temperature adjustment to 1010 after adding Zr and stirring～1060 ℃ to lower teeming temperature is conducive to manager's refinement of AuNiFeZr material and then improves the materials processing performance, selects slowly to be cast with to benefit reducing of shrinkage cavity.Facts have proved, by this preparation method, the lumber recovery of material can be brought up to more than 60%, and spillage of material can reduce by 15%～25%.
Embodiment
Ready investment casting shell or ingot mould are put into vacuum chamber, 30% of Au total amount in the AuNiFeZr alloy is put into crucible, in crucible, put into successively afterwards whole Ni, Fe, put at last remaining Au, Zr whole in the alloy is put into the feeder of vacuum induction furnace, after being evacuated to 5～15Pa for the vacuum induction furnace vacuum chamber, the melting power of vacuum induction furnace rises to 5kW, the furnace charge of putting into crucible is carried out the baking of 2～3min, melting power with vacuum induction furnace after the baking rises to 12～15kW melt, after metal charge all melts clearly in crucible, after refining 3～4min makes the abundant alloying of furnace charge, the vacuum induction melting power is down to zero, with the molten alloy conjunctiva in the crucible, close afterwards vacuum valve, vacuum-pump power supply is disconnected, be filled with the Ar of 0.04-0.06MPa pressure in the vacuum chamber of vacuum induction furnace, again Zr whole in the feeder is added crucible, the melting power of vacuum induction furnace is risen to 12～15kW, behind alloy melting, stir 2～5min, after the stirring, after alloy temperature in the crucible transferred to 1010～1060 ℃, after the vacuum induction melting power transferred to 5-8kW, with the pouring speed of 2～3kg/min, with slow charged being poured in the investment casting shell or cast iron mold of baking of alloy liquid.
Embodiment one:
1. batching and weighing:
* annotate: the design charging capacity is 3300g, and the per-cent of allocating some each elements into has comprised the rate of recovery
2. investment casting shell baking:
Investment casting shell is toasted, and storing temperature is 900 ± 30 ℃, should be greater than 1 hour to the rear soaking time of temperature.
3. vacuum induction melting:
Ready investment casting shell or ingot mould are put into vacuum chamber, 30% 881.1g of Au total amount in the AuNiFeZr alloy is put into crucible, in crucible, put into successively afterwards whole Ni297g, Fe66g, put at last remaining Au meter 2055.9g, Zr10.6g whole in the alloy is put into the feeder of vacuum induction furnace, after being evacuated to 6.5Pa for the vacuum induction furnace vacuum chamber, the melting power of vacuum induction furnace rises to 5kW, the furnace charge of putting into crucible is carried out the baking of 3min, melting power with vacuum induction furnace after the baking rises to the 14kW melt, after metal charge all melts clearly in crucible, after refining 3min makes the abundant alloying of furnace charge, the vacuum induction melting power is down to zero, with the molten alloy conjunctiva in the crucible, close afterwards vacuum valve, vacuum-pump power supply is disconnected, be filled with the Ar of 0.04MPa pressure in the vacuum chamber of vacuum induction furnace, again Zr whole in the feeder is added crucible, the melting power of vacuum induction furnace is risen to 14kW, behind alloy melting, stir 3min, after the stirring, after alloy temperature in the crucible transferred to 1015 ℃, after the vacuum induction melting power transferred to 6kW, with the pouring speed of 2kg/min, with slow charged being poured in the investment casting shell or cast iron mold of baking of alloy liquid.
Embodiment two:
1. batching and weighing:
Annotate: the design charging capacity is 2950g, and the per-cent of allocating some each elements into has comprised the rate of recovery
2. ingot mould baking:
Cast iron mold is toasted, and storing temperature is 900 ± 30 ℃, should be greater than 0.5 hour to the rear soaking time of temperature.
3. vacuum induction melting:
Ready investment casting shell or ingot mould are put into vacuum chamber, 30% 787.65g of Au total amount in the AuNiFeZr alloy is put into crucible, in crucible, put into successively afterwards whole Ni265.5g, Fe59g, put at last remaining Au meter 1837.85g, Zr9.4g whole in the alloy is put into the feeder of vacuum induction furnace, after being evacuated to 14Pa for the vacuum induction furnace vacuum chamber, the melting power of vacuum induction furnace rises to 5kW, the furnace charge of putting into crucible is carried out the baking of 2min, melting power with vacuum induction furnace after the baking rises to the 13kW melt, after metal charge all melts clearly in crucible, after refining 4min makes the abundant alloying of furnace charge, the vacuum induction melting power is down to zero, with the molten alloy conjunctiva in the crucible, close afterwards vacuum valve, vacuum-pump power supply is disconnected, be filled with the Ar of 0.06MPa pressure in the vacuum chamber of vacuum induction furnace, again Zr whole in the feeder is added crucible, the melting power of vacuum induction furnace is risen to 13kW, behind alloy melting, stir 4.5min, after the stirring, after alloy temperature in the crucible transferred to 1060 ℃, after the vacuum induction melting power transferred to 8kW, with the pouring speed of 3kg/min, with slow charged being poured in the investment casting shell or cast iron mold of baking of alloy liquid.
Claims (1)
1. casting method for preparing the AuNiFeZr precision electrical resistance alloy, it is characterized in that: 30% of Au total amount in the AuNiFeZr alloy is put into crucible, in crucible, put into successively afterwards whole Ni, Fe, put at last remaining Au, Zr is put into the feeder of vacuum induction furnace, after the vacuum induction furnace vacuum chamber is evacuated to 5～15Pa, the melting power of vacuum induction furnace rises to 5kW, the furnace charge of putting into crucible is carried out the baking of 2～3min, melting power with vacuum induction furnace after the baking rises to 12～15kW melt, after metal charge all melts clearly in crucible, after refining 3～4min makes the abundant alloying of furnace charge, the vacuum induction melting power is down to zero, with the molten alloy conjunctiva in the crucible, close afterwards vacuum valve, vacuum-pump power supply is disconnected, be filled with the Ar of 0.04-0.06MPa pressure in the vacuum chamber of vacuum induction furnace, again Zr whole in the feeder is added crucible, the melting power of vacuum induction furnace is risen to 12～15kW, behind alloy melting, stir 2～5min, after the stirring, after alloy temperature in the crucible transferred to 1010～1060 ℃, after the vacuum induction melting power transferred to 5-8kW, with the pouring speed of 2～3kg/min, with slow charged being poured in the investment casting shell or cast iron mold of baking of alloy liquid.
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| CN2013101940842A CN103305717A (en) | 2013-05-23 | 2013-05-23 | Fusion casting method for preparing precise AuNiFeZr resistance alloy |
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| CN2013101940842A CN103305717A (en) | 2013-05-23 | 2013-05-23 | Fusion casting method for preparing precise AuNiFeZr resistance alloy |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002275561A (en) * | 2001-03-13 | 2002-09-25 | Vacuum Metallurgical Co Ltd | Gold or gold-alloy material for thin film deposition and its manufacturing method, and hearth ingot using the gold or gold alloy and its manufacturing method |
| JP2002322559A (en) * | 2001-04-23 | 2002-11-08 | Sumitomo Metal Mining Co Ltd | High purity iridium sputtering target and production method therefor |
| CN1428448A (en) * | 2001-12-25 | 2003-07-09 | 中国科学院金属研究所 | Vacuum induction smelting process of Ti-Ni and Ti-Ni-Nb marmem |
| CN102021360A (en) * | 2010-12-29 | 2011-04-20 | 中南大学 | Precision resistance alloy with resistance fatigue accumulation performance and preparation method thereof |
| CN102719686A (en) * | 2012-06-29 | 2012-10-10 | 山西太钢不锈钢股份有限公司 | Method for smelting nickel-based high temperature alloy in vacuum induction furnace |
-
2013
- 2013-05-23 CN CN2013101940842A patent/CN103305717A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002275561A (en) * | 2001-03-13 | 2002-09-25 | Vacuum Metallurgical Co Ltd | Gold or gold-alloy material for thin film deposition and its manufacturing method, and hearth ingot using the gold or gold alloy and its manufacturing method |
| JP2002322559A (en) * | 2001-04-23 | 2002-11-08 | Sumitomo Metal Mining Co Ltd | High purity iridium sputtering target and production method therefor |
| CN1428448A (en) * | 2001-12-25 | 2003-07-09 | 中国科学院金属研究所 | Vacuum induction smelting process of Ti-Ni and Ti-Ni-Nb marmem |
| CN102021360A (en) * | 2010-12-29 | 2011-04-20 | 中南大学 | Precision resistance alloy with resistance fatigue accumulation performance and preparation method thereof |
| CN102719686A (en) * | 2012-06-29 | 2012-10-10 | 山西太钢不锈钢股份有限公司 | Method for smelting nickel-based high temperature alloy in vacuum induction furnace |
Non-Patent Citations (1)
| Title |
|---|
| 贵金属材料加工手册编写组: "《贵金属材料加工手册》", 30 April 1978, article "金镍铁锆", pages: 93 * |
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Application publication date: 20130918 |