powered by CADENAS

Social Share

Shibuichi (8106 views - Material Database)

Shibuichi (四分一) is an alloy which can be patinated into a range of subtle muted shades of blue or green, through the use of rokushō treatments. Its name means "one-fourth" in Japanese and indicates the standard formulation of one part silver to three parts copper, though this may be varied according to the desired effect. A 5% silver / 95% copper alloy is also marketed as "shibuichi". A wide range of colours can be achieved using the whole range of alloy compositions, even above 50% silver. 90% Copper and 10% Silver for a dark grey and down to 70% Copper and 30% Silver for lighter greys. It is a common misconception that both copper and silver oxides form, but in fact a detailed study has shown that only copper oxides are formed on the copper rich regions of the material's microstructure, while the silver rich regions are left largely untouched. For most of its history, shibuichi was mostly used to ornament various fittings for katana until the Meiji reforms, when most swordmakers began to make purely decorative objects instead. The material is often used in mokume-gane combinations. Similar alloys have been used elsewhere but the use of shibuichi to achieve different colored patinas appears to have remained nearly unknown outside Japan, until recent interest from artisans in the West. Kuro-Shibuichi (Kin-IchibuSashi)  Kuro is black in Japanese. Kuro-Shibuichi is different from others in the table. Kuro-Shibuichi is mixture of Shibuichi (40%) and Shakudō(60%) with additional 1% of Gold. Roughly proportion of Silver 9.9%, Copper 87.3%, Gold 2.8%. Kuro-Shibuich will develop black patina which is different from the black patina of Shakudo.
Go to Article

Shibuichi

Shibuichi

Shibuichi

Shibuichi (四分一) is an alloy which can be patinated into a range of subtle muted shades of blue or green, through the use of rokushō treatments. Its name means "one-fourth" in Japanese and indicates the standard formulation of one part silver to three parts copper, though this may be varied according to the desired effect. A 5% silver / 95% copper alloy is also marketed as "shibuichi".[1] A wide range of colours can be achieved using the whole range of alloy compositions, even above 50% silver. 90% Copper and 10% Silver for a dark grey and down to 70% Copper and 30% Silver for lighter greys.[2]

It is a common misconception that both copper and silver oxides form, but in fact a detailed study has shown that only copper oxides are formed on the copper rich regions of the material's microstructure, while the silver rich regions are left largely untouched.[citation needed]

For most of its history, shibuichi was mostly used to ornament various fittings for katana until the Meiji reforms, when most swordmakers began to make purely decorative objects instead. The material is often used in mokume-gane combinations. Similar alloys have been used elsewhere but the use of shibuichi to achieve different colored patinas appears to have remained nearly unknown outside Japan, until recent interest from artisans in the West.

Variation of Shibuichi[3]
name (JA) Ag : Cu, +Au[4] note mentioned colors are after patination
Shibuichi 25 : 75 Dark grey, has a trace of gold
Shiro-Shibuichi 
(Kin-IchibuSashi)
60 : 40, +1 Shiro is White in JA
lighter grey, harder, lower melting temp
Ue-Shibuichi 
(Kin-IchibuSashi)
40 : 60, +1 Ue is Upper in JA
Grey, harder
Nami-Shibuichi Uchi-Sanbu 
(Kin-IchibuSashi)
30 : 70, +1 Nami is Regular in JA
lighter than Shibuichi
Nami-Shibuichi Soto-Sanbu 
(Kin-IchibuSashi)
23 : 77, +1 Darker than Shibuichi

Kuro-Shibuichi (Kin-IchibuSashi) 

Kuro is black in Japanese. Kuro-Shibuichi is different from others in the table. Kuro-Shibuichi is mixture of Shibuichi (40%) and Shakudō(60%) with additional 1% of Gold. Roughly proportion of Silver 9.9%, Copper 87.3%, Gold 2.8%. Kuro-Shibuich will develop black patina which is different from the black patina of Shakudo.

See also


41xx steelAL-6XNAlGaAlloy 20鋁鎳鈷合金Alumel鋁合金Aluminium bronzeAluminium-lithium alloy汞齊Argentium sterling silverArsenical bronzeArsenical copperBell metalBeryllium copperBillon (alloy)BirmabrightBismanol黃銅BrightrayBritannia silver青铜Bulat steelCalamine brass铸铁CelestriumChinese silverChromelChromium hydride白金 (合金)康銅氢化亚铜Copper–tungstenCorinthian bronzeCrown goldCrucible steelCunife白铜Cymbal alloys大馬士革鋼Devarda's alloyDoré bullion杜拉鋁Dutch metal电工钢琥珀金Elektron (alloy)ElinvarFernicoFerroalloyFerroceriumFerrochromeFerromanganeseFerromolybdenumFerrosiliconFerrotitaniumFerrouraniumField's metalFlorentine bronzeGalfenolGalinstanGilding metal玻璃GlucydurGoloidGuanín (bronze)GunmetalHaynes InternationalHepatizonHiduminium高速鋼High-strength low-alloy steelHydronalium英高鎳合金不變鋼Iron–hydrogen alloyItalmaKanthal (alloy)Kovar镁铝合金Magnox (alloy)MangalloyManganin马氏体时效钢Marine grade stainless马氏体不锈钢MegalliumMelchior (alloy)MercuryMischmetalMolybdochalkosMonelΜ合金Muntz metalMushet steelNichromeNickel hydrideNickel silverNickel titaniumNicrosilNisil北歐金Ormolu透磁合金Phosphor bronze生鐵Pinchbeck (alloy)塑料Platinum sterlingPlexiglasPlutonium–gallium alloyPseudo palladiumReynolds 531銠金礦Rose's metal釤鈷磁鐵Sanicro 28Scandium hydrideShakudōSilver steel钠钾合金銲料Speculum metalSpiegeleisenSpring steelStaballoy不鏽鋼Stellite钢结构超導磁率合金Surgical stainless steelTerfenol-DTerneTombacTool steelTumbagaType metal維塔立合金耐候钢伍德合金烏茲鋼Y alloyZeron 100Sterling silverTibetan silverTi Beta-C.Titanium alloy氢化钛Gum metalTitanium gold氮化钛巴氏合金Britannia metalPewterQueen's metalWhite metal氢化铀ZamakZirconium hydride甲烷Mezzanine原子

This article uses material from the Wikipedia article "", which is released under the Creative Commons Attribution-Share-Alike License 3.0. There is a list of all authors in Wikipedia

Material Database

database,rohs,reach,compliancy,directory,listing,information,substance,material