CN112226642B - Noble metal alloy material, preparation method thereof and gold container - Google Patents

Noble metal alloy material, preparation method thereof and gold container Download PDF

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Publication number
CN112226642B
CN112226642B CN202010988406.0A CN202010988406A CN112226642B CN 112226642 B CN112226642 B CN 112226642B CN 202010988406 A CN202010988406 A CN 202010988406A CN 112226642 B CN112226642 B CN 112226642B
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simple substance
noble metal
gold material
gold
substance
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CN112226642A (en
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廖斐鸣
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Guojin Gold Co ltd
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Guojin Gold Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/02—Alloys based on gold
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G19/00—Table service
    • A47G19/02—Plates, dishes or the like
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G19/00—Table service
    • A47G19/22—Drinking vessels or saucers used for table service
    • A47G19/2205—Drinking glasses or vessels
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G21/00—Table-ware
    • A47G21/04—Spoons; Pastry servers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G21/00—Table-ware
    • A47G21/10—Sugar tongs; Asparagus tongs; Other food tongs
    • A47G21/103—Chop-sticks
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/14—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of noble metals or alloys based thereon

Abstract

The invention provides a noble metal alloy material, a preparation method thereof and a gold container. The noble metal gold material comprises elementary substances Au, G and an elementary substance V, wherein G comprises elementary substance Ti and/or elementary substance Cr, and the weight content of the elementary substance Au is more than or equal to 99.99%. The noble metal gold material has high gold purity, low heat conductivity, better low heat conductivity and better mechanical properties such as hardness.

Description

Noble metal alloy material, preparation method thereof and gold container
Technical Field
The invention relates to the field of precious metal processing, in particular to a precious metal gold material, a preparation method thereof and a gold device.
Background
At present, the living standard of Chinese people is continuously improved, the consumption concept is changed essentially, noble metal gold products are more and more activated and applied to thousands of households, the market of the noble metal gold materials is gradually expanded, and the noble metal gold products enter a wider demand stage. However, the thermal conductivity of gold is very good, and is the property of a substance to conduct heat, and the magnitude of the thermal conductivity is measured by the thermal conductivity.
Pure metals have good thermal conductivity. The heat conduction of the prepared living activated appliances such as tableware, tea sets and the like is too fast after the living activated appliances contain hot food and hot drinks, and the temperature of the outer wall is too high, so that the living activated appliances are difficult to hold by hands or ends. The addition of the alloy elements can reduce the thermal conductivity, but the addition amount is usually large to have obvious effect, so that the purity of the gold is reduced.
For the above reasons, it is necessary to provide a noble metal alloy material which satisfies the requirements of high gold purity and low thermal conductivity.
Disclosure of Invention
The invention mainly aims to provide a noble metal material and a preparation method thereof, and a gold device, so as to solve the problem that the gold material in the prior art cannot meet the use requirements of high gold purity and low thermal conductivity at the same time.
In order to achieve the above object, according to one aspect of the present invention, a noble metal gold material is provided, which includes elementary substance Au, G and elementary substance V, wherein G includes elementary substance Fe and/or elementary substance Mn, and the weight content of the elementary substance Au is greater than or equal to 99.99%.
Further, the noble metal gold material comprises 99.99% of simple substance Au, 10-50 ppm of G and the balance of simple substance V in percentage by weight.
Further, the weight ratio of G to the simple substance A is (1:9) to (5: 5).
Further, the weight ratio of G to the simple substance A is (1:9) to (2: 8).
Further, G comprises elementary substance Fe and elementary substance Mn, and the weight ratio of the elementary substance Fe to the elementary substance Mn is (1:1) - (2: 3).
Further, the noble metal gold material comprises 99.99% of simple substance Au, 10ppm of simple substance Fe and 90ppm of simple substance V by weight; or the noble metal gold material comprises 99.99% of simple substance Au, 10ppm of simple substance Mn and 90ppm of simple substance V; or the noble metal gold material comprises 99.99% of simple substance Au, 80ppm of simple substance V, 10ppm of simple substance Fe and 10ppm of simple substance Mn; or the noble metal gold material comprises 99.99% of simple substance Au, 85ppm of simple substance V, 5ppm of simple substance Fe and 10ppm of simple substance Mn; or the noble metal gold material comprises 99.99% of simple substance Au, 50ppm of simple substance V, 20ppm of simple substance Fe and 30ppm of simple substance Mn.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method for preparing a noble metal-gold material, in which a simple substance Au, G and a simple substance V are mixed and then melted to obtain a noble metal-gold material.
Further, a smelting gold material is obtained in the smelting, and the preparation method further comprises the following steps: and carrying out mechanical rolling treatment on the smelting gold material to obtain the noble metal gold material.
Further, the smelting alloy material is mechanically rolled on a milling machine, the rotating speed of a rolling head of the milling machine is omega 1800-4000 r/min, the transverse moving speed of the rolling head is v 8-45 mm/min, the diameter of the rolled steel ball is 3-12 mm, and the rolling depth is 0.05-0.2 mm.
According to another aspect of the invention, a gold container is provided, and the material of the gold container is the above-mentioned noble metal gold material.
Further, the golden device is golden tableware or golden tea.
By applying the technical scheme of the invention, the provided noble metal gold material has high gold purity and low thermal conductivity. Meanwhile, the mechanical properties of the material such as hardness are greatly improved.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
The invention mainly aims to provide a noble metal material and a preparation method thereof, and a gold device, so as to solve the problem that the gold material in the prior art cannot meet the use requirements of high gold purity and low thermal conductivity at the same time.
In order to solve the problem, the invention provides a noble metal gold material which comprises elementary substances Au, G and an elementary substance V, wherein G comprises elementary substance Fe and/or elementary substance Mn, and the weight content of the elementary substance Au is more than or equal to 99.99%. Firstly, the weight content of the simple substance Au is more than or equal to 99.99%, the gold purity grade of the noble metal gold material is promoted to be higher, and the application requirement of the high purity of the noble metal gold material is better met. Secondly, G and the simple substance V are used as micro doping components of the noble metal gold material, and under the condition of smaller addition amount, the synergistic effect promotes the material to greatly reduce the thermal conductivity under the condition of meeting the requirement of high gold-containing purity, namely the thermal conductivity is obviously reduced. And thirdly, G comprises a simple substance Fe and/or a simple substance Mn as a micro-doping component of the noble metal gold material, so that the material has higher mechanical properties such as hardness under the conditions of high gold-containing purity and lower thermal conductivity.
In a word, the noble metal gold material provided by the invention has high gold purity and low thermal conductivity. Meanwhile, the mechanical properties such as hardness of the material are greatly improved.
Preferably, the noble metal gold material comprises 99.99% of simple substance Au, 10-50 ppm of G and the balance of simple substance V by weight. The weight of the simple substances Au, G and V is controlled within the range, the purity of gold is high, and the thermal conductivity of the material is greatly reduced under the condition of meeting the requirement of high purity of noble metal.
Preferably, the weight ratio of G to the simple substance A is (1:9) to (5: 5). Within the range, the G and the simple substance V have better synergistic effect, higher thermal resistance of the material, lower thermal conductivity, higher mechanical properties such as hardness and higher strength. More preferably, the weight ratio of G to the simple substance A is (1:9) to (2: 8).
In one preferred embodiment, G includes elemental Fe and elemental Mn, and the weight ratio of elemental Fe to elemental Mn is (1:1) - (2: 3). More preferably, the noble metal gold material comprises 99.99% of simple substance Au, 10ppm of simple substance Fe and 90ppm of simple substance V by weight; or the noble metal gold material comprises 99.99% of simple substance Au, 10ppm of simple substance Mn and 90ppm of simple substance V; or the noble metal gold material comprises 99.99% of simple substance Au, 80ppm of simple substance V, 10ppm of simple substance Fe and 10ppm of simple substance Mn; or the noble metal gold material comprises 99.99% of simple substance Au, 85ppm of simple substance V, 5ppm of simple substance Fe and 10ppm of simple substance Mn; or the noble metal gold material comprises 99.99% of simple substance Au, 50ppm of simple substance V, 20ppm of simple substance Fe and 30ppm of simple substance Mn. Within the range, the advantages of each component can be more fully exerted, the noble metal gold structure is more uniform cooperatively promoted, and the low thermal conductivity and the higher hardness of the material are promoted by the good uniformity.
According to another aspect of the invention, the invention also provides a preparation method of the noble metal gold material, which comprises the steps of mixing the simple substance Au, the simple substance G and the simple substance V, and then smelting to obtain the noble metal gold material.
Based on the beneficial effects brought by the synergistic interaction of the components, the preparation method also comprises the step of mixing and smelting the simple substances Au, G and V, so that the compatibility among the components is better, the dispersity is better, the uniformity of the obtained noble metal alloy material is better, the heat conductivity is lower under the condition of meeting the requirement of high purity of the noble metal, and the mechanical properties such as hardness are better.
Preferably, a smelting gold material is obtained in the smelting, and the preparation method further comprises the following steps: and carrying out mechanical rolling treatment on the smelting gold material to obtain the noble metal gold material. After smelting, mechanical rolling treatment is carried out to promote the surface layer of the material to be subjected to grain refinement so as to form an extremely fine nano structure, the interface between grains is greatly increased, the thermal resistance is increased, the thermal conductivity is lower, and the hardness and the strength of the material are better. In the actual operation process, after the precious metal materials are obtained through rolling treatment, the precious metal materials can be made into products with different shapes by utilizing a conventional manufacturing process. Of course, after the gold product is made of the smelted gold material, the surface of the product can be rolled by applying rolling force. This is a matter of choice for the person skilled in the art and will not be described in further detail here.
In a preferred embodiment, the smelting alloy material is mechanically rolled on a milling machine, the rotating speed of a rolling head of the milling machine is 1800-4000 r/min, the transverse moving speed v of the rolling head is 8-45 mm/min, and the diameter of a rolled steel ball is 3-12 mm; preferably, in the mechanical rolling treatment process, the rolling depth is 0.05-0.2 mm. In practice, the rolling depth is usually used as an index, and the rolling depth can be adjusted by adjusting the rolling pressure, for example, the rolling depth of 0.05mm requires about 200kgf of rolling pressure, and the rolling pressure of 0.25mm requires about 1500kgf of rolling pressure. In the range, in the mechanical rolling process, the thickness of a shear deformation area formed on the surface layer of the material contacted with the rolling head is more suitable, the grain refinement size is more suitable, the average size of grains is more suitable, the formed nano structure is more uniform, the thermal resistance of the material is higher, the thermal conductivity is lower, the low thermal conductivity is better, the hardness is better, and in addition, the strength is also better.
According to another aspect of the invention, the gold ware is also provided, and the material of the gold ware is the precious metal gold material.
Based on the reasons, on one hand, the gold ware provided by the invention has the advantages that the weight content of the simple substance Au is more than or equal to 99.99%, the purity of the material gold is high, and the requirement of high purity of a noble metal product is met. On the other hand, the material also comprises G and a simple substance V which are used as more tiny doping element components, so that the material has better low heat-conducting property. Meanwhile, the mechanical properties of the material such as hardness are better, and the using effect is better.
Preferably, the golden device is golden tableware or golden tea set, such as a gold dish, a gold chopstick, a gold cup and the like.
The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.
And (3) performance characterization:
(1) and (3) testing thermal conductivity:
the laser flash method is adopted, and the equipment is a German relaxation-resistant LFA467 laser thermal conductivity instrument.
(2) Surface hardness test:
the microhardness was used and the equipment was a universal hardness tester Zwick ZHU0.2 from Zwick/Roell, Germany.
Comparative example 1
The formula of the gold material is as follows: commercially available 4N pure gold.
Thermal conductivity: 317 w/mk; hardness: HV30 ~ 40.
Example 1
The formula of the gold material is as follows:
Au 99.99％
Fe 10ppm
V 90ppm
wherein the weight ratio of Fe to the simple substance V is 1: 9.
The precious metal alloy material is obtained by mixing the components according to the formula and smelting in an atmospheric environment according to a traditional method, wherein the smelting temperature is 1200 plus 1300 ℃, the smelted alloy material is obtained, and the smelted alloy material is mechanically rolled, wherein the rotating speed of a rolling head of a milling machine is omega-4000 r/min, the transverse moving speed of the rolling head is v-8 mm/min, the diameter of a rolled steel ball is 3mm, and the rolling depth is 0.05 mm.
Thermal conductivity: compared with comparative example 1, the thermal conductivity is reduced by 52%;
mechanical properties: hardness (HV): 115.
example 2
The formula of the gold material is as follows:
Au 99.99％
Mn 10ppm
V 90ppm
wherein the weight ratio of Mn to the simple substance V is 1: 9.
The precious metal alloy material is obtained by mixing the components according to the formula and smelting in an atmospheric environment according to a traditional method, wherein the smelting temperature is 1200 plus 1300 ℃, the smelted alloy material is obtained, and the smelted alloy material is mechanically rolled, wherein the rotating speed of a rolling head of a milling machine is omega-4000 r/min, the transverse moving speed of the rolling head is v-8 mm/min, the diameter of a rolled steel ball is 3mm, and the rolling depth is 0.05 mm.
Thermal conductivity: compared with comparative example 1, the thermal conductivity is reduced by 48%;
mechanical properties: hardness (HV): 112.
example 3
The formula of the gold material is as follows:
Au 99.99％
Fe 10ppm
Mn 10ppm
V 80ppm
wherein the weight ratio of G to the simple substance V is 2: 8; the weight ratio of the simple substance Fe to the simple substance Mn is 1: 1.
The precious metal alloy material is obtained by mixing the components according to the formula and smelting in an atmospheric environment according to a traditional method, wherein the smelting temperature is 1200 plus 1300 ℃, the smelted alloy material is obtained, and the smelted alloy material is mechanically rolled, wherein the rotating speed of a rolling head of a milling machine is omega-4000 r/min, the transverse moving speed of the rolling head is v-8 mm/min, the diameter of a rolled steel ball is 3mm, and the rolling depth is 0.05 mm.
Thermal conductivity: the thermal conductivity is reduced by 46% compared with comparative example 1;
mechanical properties: hardness (HV): 115.
example 4
The formula of the gold material is as follows:
Au 99.99％
Fe 5ppm
Mn 10ppm
V 85ppm
wherein the weight ratio of the simple substance G to the simple substance V is 1.5: 8.5; the weight ratio of the simple substance Fe to the simple substance Mn is 1: 2.
The precious metal alloy material is obtained by mixing the components according to the formula and smelting in an atmospheric environment according to a traditional method, wherein the smelting temperature is 1200 plus 1300 ℃, the smelted alloy material is obtained, and the smelted alloy material is mechanically rolled, wherein the rotating speed of a rolling head of a milling machine is omega 1800r/min, the transverse moving speed of the rolling head is v 45mm/min, the diameter of a rolled steel ball is 12mm, and the rolling depth is 0.15 mm.
Thermal conductivity: compared with comparative example 1, the thermal conductivity is reduced by 38%;
mechanical properties: hardness (HV): 110.
example 5
The formula of the gold material is as follows:
Au 99.99％
Fe 20ppm
Mn 30ppm
V 50ppm
wherein the weight ratio of the simple substance G to the simple substance V is 5: 5; the weight ratio of the simple substance Fe to the simple substance Mn is 2: 3.
The precious metal alloy material is obtained by mixing the components according to the formula and smelting in an atmospheric environment according to a traditional method, wherein the smelting temperature is 1200 plus 1300 ℃, the smelted alloy material is obtained, and the smelted alloy material is mechanically rolled, wherein the rotating speed of a rolling head of a milling machine is omega 1800r/min, the transverse moving speed of the rolling head is v 20mm/min, the diameter of a rolled steel ball is 8mm, and the rolling depth is 0.2 mm.
Thermal conductivity: compared with comparative example 1, the thermal conductivity is reduced by 34%;
mechanical properties: hardness (HV): 105.
example 6
The formula of the gold material is as follows:
Au 99.99％
Mn 50ppm
V 50ppm
wherein the weight ratio of the simple substance Mn to the simple substance V is 5: 5.
The precious metal alloy material is obtained by mixing the components according to the formula and smelting in an atmospheric environment according to a traditional method, wherein the smelting temperature is 1200-1300 ℃ to obtain a smelted alloy material, and the smelted alloy material is mechanically rolled, wherein the rotating speed of a rolling head of a milling machine is omega-3000 r/min, the transverse moving speed of the rolling head is v-35 mm/min, the diameter of a rolled steel ball is 6mm, and the rolling depth is 0.15.
Thermal conductivity: compared with comparative example 1, the thermal conductivity is reduced by 37%;
mechanical properties: hardness (HV): 97.
example 7
The only difference from example 3 is that the material was not mechanically crushed.
Thermal conductivity: compared with comparative example 1, the thermal conductivity is reduced by 18%;
mechanical properties: hardness: HV 55.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the invention provides a DE noble metal material and a preparation method thereof, and a gold device, which effectively solve the problem that the gold material in the prior art cannot meet the use requirements of high gold purity and low thermal conductivity at the same time.
Particularly, in embodiments 1 to 7, on the one hand, the weight content of the simple substance Au is greater than or equal to 99.99%, and the purity of the material gold is high, so that the requirement of high purity of the noble metal product is met. On the other hand, the material also comprises a simple substance G and a simple substance V which are used as doping components with smaller amount, so that the material has lower thermal conductivity. Meanwhile, the mechanical properties such as strength and hardness of the material are better, and the using effect is better. Compared with comparative example 1, under the condition of high gold purity, the thermal conductivity is lower, the low thermal conductivity is better, and the mechanical properties such as hardness are better.
More particularly, as can be seen from the data of examples 1 to 6, in particular, the noble metal gold material comprises 99.99% of elemental Au, 10 to 50ppm of G, and the balance of elemental V. The weight ratio of G to the simple substance A is (1:9) - (5: 5). The weight ratio of G to the simple substance A is (1:9) - (2: 8). G comprises elementary substance Fe and elementary substance Mn, and the weight ratio of the elementary substance Fe to the elementary substance Mn is (1:1) - (2: 3). According to the weight content, the noble metal gold material comprises 99.99% of simple substance Au, 10ppm of simple substance Fe and 90ppm of simple substance V; or the noble metal gold material comprises 99.99% of simple substance Au, 10ppm of simple substance Mn and 90ppm of simple substance V; or the noble metal gold material comprises 99.99% of simple substance Au, 80ppm of simple substance V, 10ppm of simple substance Fe and 10ppm of simple substance Mn; or the noble metal gold material comprises 99.99% of simple substance Au, 85ppm of simple substance V, 5ppm of simple substance Fe and 10ppm of simple substance Mn; or the noble metal gold material comprises 99.99% of simple substance Au, 50ppm of simple substance V, 20ppm of simple substance Fe and 30ppm of simple substance Mn. The gold in the gold material has high purity, and meanwhile, the material has lower heat conductivity, higher mechanical properties such as hardness and higher strength.
In addition, it is clear from the data of examples 1 to 7 that the precious metal alloy material obtained by subjecting the molten alloy material to mechanical rolling treatment has lower thermal conductivity and better hardness.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The precious metal alloy material is characterized by consisting of elementary substances Au, G and V, wherein G consists of elementary substance Fe and/or elementary substance Mn; the noble metal gold material consists of 99.99% of the simple substance Au, 10-50 ppm of the G and the balance of the simple substance V, and the weight ratio of the G to the simple substance V is (1:9) - (5: 5).
2. The noble metal gold material according to claim 1, wherein the weight ratio of G to the simple substance V is (1:9) - (2: 8).
3. The noble metal gold material according to claim 1 or 2, wherein G is composed of the simple substance Fe and the simple substance Mn, and the weight ratio of the simple substance Fe to the simple substance Mn is (1:1) - (2: 3).
4. The noble metal-gold material according to claim 1 or 2, wherein, in terms of weight content,
the noble metal gold material consists of 99.99% of the simple substance Au, 10ppm of the simple substance Fe and 90ppm of the simple substance V; alternatively, the first and second electrodes may be,
the noble metal gold material consists of 99.99% of the simple substance Au, 10ppm of the simple substance Mn and 90ppm of the simple substance V; alternatively, the first and second electrodes may be,
the noble metal gold material consists of 99.99% of the simple substance Au, 80ppm of the simple substance V, 10ppm of the simple substance Fe and 10ppm of the simple substance Mn; alternatively, the first and second electrodes may be,
the noble metal gold material consists of 99.99% of the simple substance Au, 85ppm of the simple substance V, 5ppm of the simple substance Fe and 10ppm of the simple substance Mn; alternatively, the first and second electrodes may be,
the noble metal gold material consists of 99.99% of the simple substance Au, 50ppm of the simple substance V, 20ppm of the simple substance Fe and 30ppm of the simple substance Mn.
5. The method for preparing the noble metal gold material according to any one of claims 1 to 4, wherein the noble metal gold material is obtained by mixing and then smelting elementary Au, G and V.
6. The method for preparing noble metal-gold material according to claim 5, wherein the smelting produces smelted gold material, and the method further comprises: and carrying out mechanical rolling treatment on the smelting gold material to obtain the noble metal gold material.
7. The preparation method of the precious metal gold material according to claim 6, wherein the smelting gold material is subjected to mechanical rolling treatment on a milling machine, the rotating speed of a rolling head of the milling machine is omega = 1800-4000 r/min, the transverse moving speed of the rolling head is v = 8-45 mm/min, the diameter of a rolled steel ball is 3-12 mm, and the rolling depth is 0.05-0.2 mm.
8. A gold implement, characterized in that the material of the gold implement is the noble metal gold material according to any one of claims 1 to 4.
CN202010988406.0A 2020-09-18 2020-09-18 Noble metal alloy material, preparation method thereof and gold container Active CN112226642B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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JPS63145729A (en) * 1986-03-28 1988-06-17 Nittetsu Micro Metal:Kk Gold wire for bonding semiconductor device
CN1104413A (en) * 1993-04-08 1995-06-28 新日本制铁株式会社 Gold alloy wire for bonding semiconductor device
JPH11222632A (en) * 1998-02-05 1999-08-17 Mitsui Mining & Smelting Co Ltd Production of high purity gold
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