JIS T6107：1991 Dental gold-silver-palladium alloy solders(E)国外标准规范

UDC669.225'234'21.018.42:621.791.36:615.465:616.314-77

JAPANESEINDUSTRIALSTANDARD

Dentalgold-silver-palladiumalloysolders

JIST6107-199

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UDC669.225'234'21.018.42:

621.791.36:616.314-77

JAPANESEINDUSTRIALSTANDARD

Dentalgold-silver-palladium

alloysolders

JIS

T6107-1991

1.Scope

ThisJapaneseIndustrialStandardspecifiesgold-silver-palladiumalloysolders,hereafterreferredtoasthe"palladiumalloysolders",forsolderinggold-silver-palladiumalloyusedfordentalservice.

Remarks:Thefollowingstandardsarecitedinthisstandard:

JISP3801FilterPaper(forChemicalAnalysis)

JISR6253WaterproofAbrasivePapers

JIST6105DentalWroughtGold-Silver-PalladiumAlloysJISZ2241MethodofTensileTestforMetallicMaterials

JISz8721SpecificationofColorsAccordingtoTheirThreeAttributes

2.Quality

2.1AppearancePalladiumalloysoldersshallbehomogeneouswithametalliclusterandshallnotbecoveredwithforeignsubstancesonthe

surface.

2.2ChemicalcompositionThemaincomponentsofpalladiumalloy

soldersshallbeaminimumof158gold,aminimumtotalof308goldand

palladiumandaminimumof308silver,andwhentestedinaccordancewith

3.1,thechemicalcompositionshallnotbelessthanthenumericalvaluesdesignatedin5.(2).

2.3LiquiduspointWhentestedinaccordancewith3.2,theliquiduspointshallbe950Corbelow.

partshaPelotpegff.Whentestedinaccordancewith3.3,thesoldered

2.5DiscolorationWhentestedinaccordancewith3.4,palladiumalloysoldersshallnotbediscolored,orifdiscolored,thehueofthestandard

colorchartspecifiedinJISz8721shallbe10YR,7minimuminlightness,and6maximuminchroma.

3.Testing

3.1Quantitativetesting

3.1.1PreparationandsamplingmethodofspecimensAfterremovingthesubstancessuchasstainsandfatadheringtothesurfaceofthe

palladiumalloysoldersbygrindingwithNo.800waterproofabrasivepaperspecifiedinJISR6253,finelycutintopiecesapprox.1mminwidthand

approx.0.2mminthickness,degreasewithpetroleumbenzine.

T6102-1991

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Washwithwater,dryinadesiccator,preparespecimensofapprox,0.5g,andweighprecisely.

out8sCalowDeterminationofgoldThedeterminationofgoldshallbecarried

(1)Transferthespecimensintoabeaker,add20mlofdilutednitricacid(1→2)(I),warminawaterbath,anddissolvetheelementsotherthangold.Ifwhiteprecipitateisproduced,quantifyit

bythemethodof3.1.3.

(2)Afterlettingitcool,addwarmwatertobringto50mlandfilterwithafilterpaperofclass5BspecifiedinJISP3801.Wash

theresiduetwotimeswithdilutednitricacid(1→100)(¹),

washwellwithwarmwateruntilthereactionofsilvernitrate

disappears,andcombinethewashingsandthefiltratetoserveasthesamplesolutionfordeterminationofsilverandpalladium.

(3)Afterdryingtheresiduewithfilterpaper,immediatelyincinerate

thefilterpaperinaporcelaincrucibleofaknownmassby

heating,heattoapprox.800Cuntilitbecomesagoldencolor,letitcoolinadesiccator,weighthemassofgold,repeatthisoperationuntilitreachesaconstantmass,andcalculatethe

contentofgoldusingthefollowingformula:

where,G:contentofgold(8)

A:massofspecimen(g)

B:massofgold(g)

Note(1)Theindicationoftheconcentrationofasolutionby

(1→2)or(1→100)meanstheratioinwhich1gofsolidchemicalsor1mlofliquidchemicalsare

dissolvedwithwater,ete,to2mlor100mlintotalamount,respectively.

Thedeterminaeterogolaofpolddipaldisolderscoltarncgntainingtbecarriedoutasfollows:

(1)Evaporatethesamplesolutiontodryness,letitcool,add10mlofdilutednitricacid(1→2)(¹)and50mlofwarmwater,

gentlyboil,letstandfor1hour,filterwithfilterpaperofclass

5CspecifiedinJISP3801byaddingfilterpaperpulp,washwellwithwarmwater,andusethefiltrateandwashingsasthesamplesolutionfordeterminationofsilverandpalladium.

(2)Transfertheresidueintoabeaker,addapprox.15mlofaqua

regia(nitricacid/hydrochloricacid,1:3)todissolveit,concen-

tratebyevaporationintoasyrupystate,add5mlofhydrochloricacid,repeatthisoperationagain,add5mlofhydrochloricacid,

andthenadd50mlofwarmwaterandwarmthesolution.Afterfiltration,washtheresiduewellwithwarmwater.

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T6107-1991

(3)Combinethewashingswiththefiltrate,addwatertobringto

approx.200ml,warmatapprox.80°Cinawaterbath,anddripsodiumsulfitesolution(5→100)(¹)shakinggentlytodeposit

thegoldbyreduction.

(4)Whentheprecipitateofgoldhascondensedandthesolution

becomestransparent,add5mlofsodiumsulfitesolution(5→100)(¹)inexcess,andwarmfor30minutes,butdonotbringtoboil.Afterfiltratingtheprecipitatewithfilterpaperofclass5C

specifiedinJISP3801,treattheresidueonthefilterpaperinaccordancewith(3)of3.1.2,anddeterminethecontentofgold.

3.1.4DeterminationofsilverThedeterminationofsilvershallbecarriedoutasfollows:

(1)PlacethesamplesolutionintoabrownErlenmeyerflask,warmtoapprox.80℃,dripdilutedhydrochloricacid(1→6)(¹)while

stirring,producesilverchlorideprecipitate,add1mlofdilutedhydrochloricacid(1→6)(¹)inexcess,agethesolutionina

waterbath,andletstandinadarkplacefor8hoursormore.Filterwithfilterpaperofclass5CspecifiedinJISP3801,

washtheresiduewellwithdilutednitricacid(1→100)(¹),andusethefiltrateandwashingsasthesamplesolutionfordetermi-

nationofpalladium.

(2)Washtheprecipitateintoabeaker,dripwarmdilutedaqueous

ammonia(1→2)(¹)ontofilterpaper,anddissolvethesilver

chlorideonthefilterpaperandintheprecipitate.Afterwarm-

ing,dilutewithwarmwaterto150ml.Precipitatesilverchloride

againbydrippingdilutednitricacid(1→2)(¹),add1mlof

dilutedhydrochloricacid(1→10)(¹),stir,andwarmthesolution.

Gentlyboilfor5minutes,andletitstandinadarkplacefor

8hoursormore.

(3)Filterwithasintered-glassfilterofaknownmass(G4)andwashitfirstwithdilutednitricacid(1→100)(¹)andthenwell

withcoldwater,andcombinethefiltrateandwashingstothe

samplesolutionfordeterminationofpalladium.Dryatapprox.110°℃untilitreachesaconstantmass,letcoolinadesiccator,weighthemass,andcalculatethecontentofsilverusingthe

followingformula.

where,S:contentofsilver(8)

A:massofspecimen(g)

C:massofsilverchloride(g)

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T₆107-1991

Thedeterminationofpalladiumshall

bec3riedoDeterfinationofpalladium

(1)Transferthesamplesolutionintoameasuringflaskof500mlincapacity,bringto500mlbyaddingwater,andaccuratelytake100mlofaliquot.Condensebyevaporationtoasyrupystate.Add5mlofhydrochloricacid,andrepeattheoperationof

condensationbyevaporationuntilthepalladiumhascompletelycombinedwiththechloride.

(2)Add5mlofhydrochloricacidandwarmwatertobringto300ml,andwarmtoapprox.80°C.Add25mlofdimethylglyoximealcoholsolution(1→100)(¹)whilestirring,precipitatethepalladium,

andagetheprecipitateofpalladiumdimethylglyoximebylettingitstandatapprox.80℃forapprox.1hour.

(3)Afteragingtheprecipitate,filterwithasintered-glassfilter

(G4)ofaknownmass,washwellwithwarmwater,andlastly

washwithethylalcohol(95/8ormorepure).Dryatapprox.110℃untilitreachesaconstantmass,letitcoolina

desiccator,weighthemass,andcalculatethecontentofpalladiumusingthefollowingformula.

where,P:contentofpalladium(8)

A:massofspecimen(g)

D:massofpalladiumdimethylglyoxime(g)

3.2LiquiduspointtestMeltthepalladiumalloysoldersinacrucible,measurethechangeintemperatureduringcoolingwithathermometer,drawacoolingcurve,anddeterminetheliquiduspoint.

Forthistest,palladiumalloysolderswhichhasnotyetbeenusedshallbeused.

3.3Tensiletest

3.3.1TestpiecesThetestpiecesshallbethealloyedplate0.3mminthicknesswhichconformstoJIST6105.

ofthetestpseesshalieeasshowftestpiece

Theshapeanddimensions

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T6107-1991

Fig.1.Testpiecesforthetensiletest

Unit:mm

3.3.3SolderingExcluding5mminwidthfromthecenterofthe

solderedpart,thetestpiecesshallbecoveredwiththeinvestmentmaterialandsolderedwithfluxspecifiedbythemanufacturerandapprox.0.05gofpalladiumalloysoldersfromonesideusingablow-pipeflameorthelike.

Immediatelyaftersoldering,theinvestmentmaterialshallberemovedtoletitcool.

3.3.4TestmethodThetensiletestshallbecarriedoutin

accordancewiththemethodspecifiedinJISZ2241untilthesolderedtestpieceisfracturedbytension.

3.4DiscolorationtestofsolderedpartAftersolderingthepalladium

alloysoldersinaccordancewith3.3.3onadentalwroughtgold-silver-

palladiumalloyplatewhichconformstoJIST6105asshowninFig.2,the

discolorationtestshallexaminethestateofdiscolorationoftestpiecesfully

immersedin50mlof0.18ofsodiumsulfidesolutionmaintainedatatempera-tureof37±2Cfor24hours(seeFig.3).

Fig.2.Discolorationtestpiece

Unit:mm

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T6107-1991

Fig.3.Discolorationtest

Testpiece

4.Designationsystemofproduct

Theproductshallbedesignatedwiththetitleofthestandard.

Example:Dentalgold-silver-palladiumalloysolder

5.Marking

Thefollowingdetailsshallbemarkedonthepackageofpalladiumalloy

solders.

(1)Titleofstandard

(2)Contentofeachcomponent(8)

(3)Liquiduspoint

(4)Mass

(5)Manufac