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A kind of silver master alloy and its preparation method and application
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An intermediate alloy and alloy technology, applied in the field of alloys, can solve the problems of large cadmium volatilization loss, etc., and achieve the effects of less cadmium volatilization, stable cadmium content, and simple and easy preparation process
Active Publication Date: 2016-06-22
METALINK SPECIAL ALLOYS CORP
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Problems solved by technology
Traditionally, the master alloy is designed so that the melting temperature of the master alloy is slightly lower than the melt temperature of Ag80InCd, but because the master alloy is melted before Ag80InCd or the liquid state of the master alloy is overheated, the loss of cadmium volatilization is large.
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Embodiment 1
[0021] (1) Select a high-purity graphitecrucible, and passivate the inner surface of the crucible;
[0022] (2) Take by weighing Cd4.7kg, take by weighing Ag5.3kg, add electric furnace; Wherein Ag is Ag99.99, and wherein Cd is Cd99.995;
[0023] (3) Put the above Ag and Cd into the vacuum induction furnace, lock the furnace cover, extract in a vacuum of 10Pa, feed in argon gas to 80KPa and melt it with electricity, after it is completely melted, stir evenly, measure the temperature at 950°C, and cast it into an ingot;
[0024] (4) sampling test analysis: the results are shown in Table 1;
Embodiment 2
[0026] (1) Select a high-purity graphitecrucible, and passivate the inner surface of the crucible;
[0027] (2) Take by weighing Cd2.35kg, take by weighing Ag2.65kg, add electric furnace; Wherein Ag is Ag99.99, and wherein Cd is Cd99.995;
[0028] (3) Put the above Ag and Cd into the vacuum induction furnace, lock the furnace cover, extract in a vacuum, 20Pa, pass in argon gas to 90KPa, transfer electricity to melt, after all melted, stir evenly, measure the temperature at 900°C, and cast Ingot;
[0029] (4) Sampling test analysis: the results are shown in Table 1,
Embodiment 3
[0031] (1) Select a high-purity graphite crucible, and passivate the inner surface of the crucible;
[0032] (2) Take by weighing Cd7.05kg, take by weighing Ag7.95kg, add electric furnace; Wherein Ag is Ag99.99, and wherein Cd is Cd99.995;
[0033] (3) Put the above Ag and Cd into the vacuum induction furnace, lock the furnace cover, extract in a vacuum of 1Pa, pass in argon gas to 110KPa, transfer electricity to melt, after all melted, stir evenly, measure the temperature at 850°C, and cast into ingot ;
[0034] (4) Sampling test analysis: the results are shown in Table 1,
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Abstract
The invention discloses a silver master alloy, which comprises the following components by weight percentage: 43-47% of Cd, 53-57% of Ag, other individual impurities ≤ 0.03%, and the sum of impurities ≤ 0.25%. The invention also discloses the preparation method and application of the master alloy. The preparation process of the master alloy is simple and easy. When applied to the melting of Ag80InCd alloy, less cadmium volatilizes. When applied to the melting of Ag80InCd alloy, the cadmium content is stable.
Description
technical field [0001] The invention relates to the field of alloys, in particular to an intermediate alloy and its preparation method and application. Background technique [0002] The melting temperature of Ag80InCd alloy is 800-1000℃, and the boiling point of cadmium element is 765℃. It is very difficult to add cadmium element by metal cadmium, so it is generally used to add cadmium by way of master alloy. Traditionally, the master alloy is designed so that the melting temperature of the master alloy is slightly lower than the melt temperature of Ag80InCd, but because the master alloy is melted before Ag80InCd or the liquid state of the master alloy is overheated, the loss of cadmium volatilization is large. Contents of the invention [0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the first purpose of the present invention is to provide a kind of master alloy. The second object of the present invention is to provide a method f...
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