Microalloy strengthened hard pure gold and preparation method thereof

A hard and intermediate alloy technology, applied in the field of micro-alloy strengthening hard pure gold and its preparation, can solve problems such as difficulty in realization

Active Publication Date: 2016-03-02
SHANGHAI QIJIU NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, this strengthening phase must be achieved through solid solution treatment and aging heat treatment at medium temperature and long time, which is obviously difficult to achieve in the traditional jewelry processing industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] In some aspects of the present invention, a method for preparing the aforementioned hard solid gold material is also proposed, including:

[0025] The 99.99% pure gold material is mixed with the strengthening element calcium and titanium mixed powder according to the mass ratio of 9:1, and the master alloy is prepared by vacuum induction melting;

[0026] Then, the prepared master alloy and 99.99% pure gold material are subjected to secondary vacuum induction melting at a weight ratio of 1:9. After the alloy is melted at high temperature, rare earth element powder is added, and casting or block making is carried out after refining.

[0027] Preferably, the mass ratio of the strengthening elements calcium and titanium added in the method is 1-4:5-8.

[0028] Preferably, the added amount of the rare earth element powder is 0.01-0.1% of the mass of the final smelted product. The rare earth element powder added in such a proportion is dysprosium and / or terbium element powd...

Embodiment 1

[0033] First of all, the master alloy is refined by batching, or called "filling mouth", the batching ratio is: calcium 1.4%, titanium 6.8% (in the form of mixed powder), and the rest is 99.99% pure gold material. Add the mixed material into the crucible of the vacuum melting furnace, and start vacuuming. Vacuum up to 3.7×10 -3 After Pa, start heating and smelting, and the melt temperature is measured by an infrared thermometer. When the temperature reaches 1480°C, reduce the current and start refining. The refining time is 30 seconds. After the melting is completed, pour it into a copper crucible to obtain an intermediate alloy. Then mix the master alloy and 99.99% pure gold material according to the ratio of 1:9, vacuum melting again, cover the upper layer with pure gold when adding materials, and after the alloy is completely melted through the observation window, quickly add the rare earth element Dysprosium powder, the amount added It is 0.05%, electromagnetically stirr...

Embodiment 2

[0036] Firstly, the master alloy is refined by batching, and the batching ratio is: calcium 2.5%, titanium 5.1% (in the form of mixed powder), and the rest is 99.99% pure gold material. Add the mixed material into the crucible of the vacuum melting furnace, and start vacuuming. Vacuum up to 3.4×10 -3 After Pa, start heating and smelting, and the melt temperature is measured by an infrared thermometer. When the temperature reaches 1510°C, reduce the current and start refining. The refining time is 35 seconds. After the melting is completed, pour into a copper crucible to obtain an intermediate alloy. Then mix the intermediate alloy and pure gold according to the ratio of 1:9, and carry out vacuum smelting again. When adding materials, cover the upper layer with pure gold. After the alloy is completely melted through the observation window, quickly add dysprosium powder, a rare earth element, in an amount of 0.06%. , electromagnetically stirred evenly, then refined for 28 seco...

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Abstract

The invention provides a hard pure gold material for pure gold jewelry. The hard pure gold material is prepared from, by mass, 0.1-0.4% of calcium, 0.5-0.8% of titanium, 0.01-0.1% of rare earth elements and the balance gold, wherein the gold content is 99.0% or above. In the preparation process, by introducing the trace element calcium, a dispersed cluster structure is formed in a pure gold matrix, and the structure can effectively promote precipitation of a nano-scale gold titanic compound strengthening phase, so that the hardness and strength of the pure gold are greatly improved. The pure gold in the design is suitable for conventional jewelry processing processes and can be applied to various kinds of pure gold jewelry.

Description

technical field [0001] The invention relates to the technical field of gold manufacturing, in particular to a hard pure gold material used in jewelry production and a production process thereof, in particular to a micro-alloy strengthened hard pure gold and a preparation method thereof. Background technique [0002] High-purity gold products have always been loved and favored by the world, occupying a very high proportion in the Chinese jewelry market, and have also received attention and application in many emerging industries. For example, Apple recently launched a gold version of the Apple Watch with a minimum price of $10,000. One of its biggest selling points is its luxurious gold shell. However, the hardness of ordinary pure gold is very low, and it is easy to wear or deform during daily wear, affecting the appearance and brightness of jewelry, and even causing the inlaid gemstones to fall off. Therefore, it is very necessary to greatly improve the hardness and streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/02C22C1/02
Inventor 金明江李伟丁希可
Owner SHANGHAI QIJIU NEW MATERIAL TECH CO LTD
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