White gold (English spelling)

Japanese: ホワイトゴールド（英語表記）white gold

A gold alloy that has been whitened by adding nickel and zinc. Its uses are the same as gold, including art and crafts, various types of jewelry, electrical contacts for communication devices, and dental alloys. The product grade is indicated by adding WG to the gold carat, and for 14K gold it is stamped K14WG. Standard products contain 10-25% nickel, 1-5% zinc, and small amounts of silver and copper, and are available in various types from 10 to 18K gold. Nickel forms a solid solution with gold and hardens, and at low temperatures it undergoes precipitation hardening, further increasing its strength. This effect is even more pronounced when platinum group elements are added, and for dental applications that require corrosion and wear resistance in particular, platinum-added gold is made by adding platinum, palladium, etc. An example composition is 55-70% gold, 5-15% silver, 6-16% platinum, and 10-15% copper, and the tensile strength reaches 590-980MPa. The addition of zinc and copper is to lower the melting point and improve castability.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

ニッケル，亜鉛などの添加で白色化した金合金。用途は金と同じで，美術工芸品，各種装身具，通信機器用電気接点，歯科合金など。製品品位は金のカラットに WGを付し，14金なら K14WGと刻印する。普通品はニッケル 10～25%，亜鉛1～5%，ほかに若干の銀，銅などを加えたもので，10～18金の各種がある。ニッケルは金と固溶体をつくって硬化し，低温では析出硬化があって一層強度を増す。その効果は白金族元素添加の場合さらに著しく，特に耐食・耐摩耗を要する歯科用には，白金加金といって白金，パラジウムなどを添加する。組成例は，金 55～70%，銀5～15%，白金6～16%，銅 10～15%の程度で，引張り強さ 590～980MPaに達する。亜銅や銅の添加は融点を下げ鋳造性をよくするためである。

出典　ブリタニカ国際大百科事典小項目事典ブリタニカ国際大百科事典小項目事典について　情報

<<: White Mountains - White Mountains

>>: White-collar crime