Silver article
AssigneeMISTY COLLECTION Co., LTD.
InventorsMasami Munakata, Kohtaro Munakata
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Abstract
Provided are a silver article formed using pure silver, which has high Vickers hardness and prohibits the occurrence of metal corrosion and the occurrence of discoloration; and its method. Disclosed are a silver article and its method, wherein the Vickers hardness is adjusted to 60 HV or higher, and when the height of the peak of 2θ=38°±0.2° by an XRD is designated as h1, and that of 2θ=44°±0.4° is designated as h2, h2/h1 is adjusted to 0.2 or greater.
Claims8
A silver article formed from pure silver or a silver alloy having a purity of 99.9% by weight or higher excluding the silver article having 90 to 100 of the Vickers hardness measured at the reduction rate of a cross section which is 95% or more without heat treatment, and the silver article includes configurations of (1) to (4):
- (1) a mixing amount of Al is 0.05% or less by weight,
- (2) the Vickers hardness of the silver article is adjusted to a value within the range of 80 to 200 HV,
- (3) when the height of the peak of 2θ=38°±0.2° in an X-ray diffraction chart obtained by an XRD analysis of the silver article is designated as h1, and the height of the peak of 2θ=44°±0.4° is designated as h2, the value of h2/h1 is adjusted to 0.5 or greater, and
- (4) when the Vickers hardness of the silver article is designated as HV and the half-value width of the peak of 2θ=44°±0.4° obtained by an XRD analysis of the silver article is designated as W2, the value of HV×W2 is 25 or greater.
Dependencies are inferred from the claim text.