Silver solders or brazing alloys and their use.

Peter G. Johns. (2006) Silver solders or brazing alloys and their use. UK Patent No. GB2408269 - granted 22/2/2006..

Full text is not in this repository.

Official URL: http://www.argentiumsilver.info

Abstract

The UK has hallmarking laws that govern the minimum amount of silver that must be present in solders for joining sterling silver. The minimum quantity is set at 65% silver. Many other countries allow solders with lower silver content of 55%. Higher silver solders usually have higher melting and working temperatures, which require higher levels of skill to use and can cause distortion and deep firestain in the piece being soldered: this can lead to increased and expensive finishing costs. Lower silver content solders offer lower melting and working temperatures, however a disadvantage is a decrease in the whiteness of the solder, which causes solder seams to become clearly visible on finished pieces, thus limiting the creative scope of the designer/maker. Silver solders for jewellery and silverware have remained the same for at least 75 years. The challenge of this research was to provide solders that: - conform to UK hallmarking laws - are easy to use, with low temperature flow properties that are normally found in the lower silver content solder alloys - have a good white colour to match the colour of Argentium Silver - have good tarnish resistant properties The patent granted from this research and the commercial alloys produced by Stern-Leach in the USA derived from over 40 individual solder alloys, made and tested at Middlesex University. A range of paste solders has also been developed for furnace soldering operations. Current work is being conducted with designer/makers in best utilising these new solders.

Item Type:Patent
Research Areas:Middlesex University Schools and Centres > School of Art and Design > Art & Design
ID Code:541
Deposited On:26 Nov 2008 13:29
Last Modified:06 Feb 2013 10:02

Repository staff only: item control page

Full text downloads (NB count will be zero if no full text documents are attached to the record)

Downloads per month over the past year