Method of producing a copper-germanium-boron master alloy and its use in making silver-copper alloys.
Patent
Johns, P. 2008. Method of producing a copper-germanium-boron master alloy and its use in making silver-copper alloys.
Title | Method of producing a copper-germanium-boron master alloy and its use in making silver-copper alloys. |
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Authors | Johns, P. |
Patent applicant | Peter Johns |
Abstract | Most of the largest manufacturing jewellery companies in the world are located in South East Asia or India. Governments in that region levy high taxes on imported silver and semi-finished silver products. Manufacturers therefore prefer to purchase a master alloys for their jewellery production because they attract much less import duty. Master alloys consist of all the elements in a silver alloy, except the silver. The jewellery manufacturer then melts the master alloy with silver he has sourced from within his own country. The difficulty in supplying master alloy is that the conditions under which it is melted may vary widely. If the conditions are not optimal there is a danger that some of the more reactive elements in the alloy may be lost. Silver-copper-germanium alloys always require a grain refiner in the form of boron. Boron easily reacts with oxygen and it is necessary to ensure a generous level of boron is available in the master alloy. This is to allow for any loss during subsequent re-melting and investment casting. |
Publication dates | |
26 Mar 2008 | |
Publication process dates | |
Deposited | 28 Apr 2011 |
Output status | Published |
Digital Object Identifier (DOI) | https://doi.org/EP1794335 |
Language | English |
https://repository.mdx.ac.uk/item/83561
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