Silver rubber bands

. only for photographic emulsions, secondarily nell.industria electrical worker and electronics, like metal from contact for amperages and voltages of. He comes deposited on glass for giving one reflecting surface metallic silver particles dispersed (approximately 5 spalmate on not conductive materials in order to metalize them. 600 C, 55 MPa of resistance to bending (you see figure). : Searches sull.effetto dell.ossigeno on the hardness dell.argento of several purezze annealed indicate that l.ossidazione of the impurities during the re-cooking oxidant generally cause a substantial increment of the superficial hardness and refrain the increase of grains, effects that are absent nell.argento spectroscopically pure. from cold work and, probably from oxygen re-cooking in H to 650 C and 27 after re-cooking to the air to 650 C: l.argento it does not seem to oxidize itself to temperature ambient in air, but?ttaccato and oxidized dall.ozono. oxides d.argento, which have quickly high resistivit?l.argento, as they make with copper and velocit?i the oxidation in sulfur?eterminata atom atmosphere dall.apporto perch?o layer of. It reduces the reflecting power dell.argento and of it it increases the resistivit? especially to running lowlands, for its. Velocit?i the solfatazione dell.argento indoor in one large citt? of. ?olto tried a having alloy a high silver content that resists?ecessario all.ossidazione but?coperto that a high content of Pt and Au (until. They have been used several coverings in so far as but that one pi?fficace, even if little used?isultato: l.argento pure acetic?esistente all.acido. And resistant also to all the other acids. And attacked from all the metals to low melting point which mercury, sodio, potassio (and all their compounds). For this a use that to pu?ettere in contact l.argento with these metals goes as an example avoided (in the exchangers. And resistant to the idrossidi of sodio and potassio?sato in laboratory for fusions of caustic substances and?tato taken in consideration for equipment of great dimensions it endures a phenomenon of creep to the temperature of fusion of these idrossidi, therefore its use in this field would demand l.uso of support containers. And attacked from bromides, ioduri and chlorides in humid atmosphere also rather presence than oxidating air or other agents dissolves: the alloys pi?omuni silver-branch are calls Sterling Silver. (92,5 % of Ag minimal) and Coin Silver. (90Ag. 10Cu). The sterling it must contain the percentage at least. The rest?oggetto to restrictions even if normally?ame in how much other metals do not have its effectiveness come.Gli use typical of this alloy are multiple dall.antichit?ino practically to the days our hardening effect sull.argento but it lowers the melting point considerable cos?ome the conducibilit?ermiche and electrical workers in the dinner services and for the jewelry shop. Coin the?tato Silver used in the United States which metal from currency as the name indicates and comes running used in the contacts electrical workers when l.argento pure not to pu?ssere used perch?roppo motivatings force or to pu?ssere subject to pitting. some employment like alloy from welding or brazing. and cold?bbastanza resistant and used for contacts electrical workers in shape of. In the below figure they are indicated: l.aggiunta of branch it very increases the resistivit?e added in solution during the hardening and less if hasty during l.invecchiamento or for slow: to ambient temperature the presence of branch in solid solution, has a negligible effect on the resistance to corrosion rich areas in branch, than?eggermente little nobleman dell.argento it could give some problem for l.effetto electrolytic, but the potential difference them, apparently?anto small not to give problems in the similar normal schools, to pu?spettare itself to us, some selective attack sufficiently elevated, the copper is oxidized selective. it has some consequence in the contacts electrical workers perch?omporta pi?lte. fastly oxidizes a lot and l.ossigeno to pu?iffondere in profondit?on facilit? forming one called substance. fire.. Un.ora of exposure to this temperature oxidizes the alloy to the 7. This in past was a great problem, but with the alloy production very deossidate and l.uso of an atmosphere not oxidant, the effects dell.ossidazione of copper have been diminished: an alloy in issue does not have to be used in presence of sulfur or solfuri in?acilmente ossidabile how much from these compounds, or must be protect with an adequate covering for: in fusing the alloy silver. branch the oxygen content must be held low before the process of tap, carried out. Where the conducibilit?lettrica not?mportante?onveniente to make. Fusing the material under grafite cover or pouring the alloy through one flame reducing during the stoccaggio, the result?o. During the calandratura short res-cooking in vapor atmosphere or bath of know them to temperatures that they go from the 540 C to the 650 C are processes. Where pi?levate temperatures are used?ecessaria a hardening in order to produce to the complete malleabilit?eliminano single rimovendo one quantit?onsiderevole of metal, mechanically: sterling the Silver to pu?ssere hardened for aging without difficolt? part of the pregi of this alloy, that is its appreciable propriet?eccaniche and not, derive dall.indurimento for cooling in. Solubilit?el the branch nell.argento to 650 C?irca of 4 % and to 730 C. Cos?o sterling Silver tried to these temperatures?uplex with a small to pile of rich phase in branch dispersed in the matrix. Treatments of aging cause the precipitation of the rich phase in branch and if it extends increase conducibilit?Il coin the Silver considerable to you it remains two-station communication after any treatment of re-cooking and ages to the same way of the alloy to the 7, mechanics of coin the Silver are virtually the same ones of those of the sterling after the normal treatment of re-cooking to approximately 650 C, poich?a composition of the rich phase in same silver sar?a. The alloys containing from the 20 to 30 % of Cu have pi?ase rich in branch and show little hardening after deliberate aging of the phenomenon of precipitation hardening in the Ag-Cu. alloys temperature of solubilizzazione 730 C?iuttosto near the temperature of solidus and demand a control of the T better than that available one near. In alloys heavy deossidate with P?ossibile a fusion in the edges grain to 700 730 C and when this happens the piece pu?Inoltre these alloys is extremely blows us to the T of solubilizzazione and is easy danneggiabili. After a welding the metal that the splice zone encircles to pu?ssere be heated until beyond the T of solubilizzazione and the all.aria cooling to pu?ausare a some hardening all.ammorbidimento that to pu?isultare when metals hardened for like metal of filling in order knitting alloys of branch, nickel knit and cobalt, stainless steel and not and precious metals. Test of short duration on the alloy 50Ag. 15. 18 Cd indicate that the loss of resistance to 220 C?irca the 20. 30 % regarding the ambient resistance to temperature while containing one low percentage in Zn and Cd has one resistance pi?levata to high temperature that not those with a high content in these elements: the conducibilit?lettrica of these alloys varied from 10 to 80% IACS. alloys with pi?lto contained of contained silver and pi?asso in zinc has (high the Silver, low zinc) has found some use as contact electrical worker that one of the not ferrous metals with which it comes used. in sheets or spin with reductions of 50 % or pi?urante or in used means to the several ones where?ichiesta un.alta conducibilit?ia thermal that electrical workers, which do not come intaccata from the high possible temperatures of service or dalla.: (a) contacts electrical workers who must be fixed for brazing without to lose in hardness, (b) clip to motivating force to high conducibilit?ermica operating in small letters containers from empty, (c) relays to motivating force to high conducibilit?lettrica operating to high temperature and (d) you leave sottoponibili electrical workers to heavy workings with consequent: these alloys have lowland velocit?i creep (approximately a tenth one of that one dell.argento) and in conditions of creep they are fractured. To elevated temperatures of service, breaches captain of usual for breach rather than for relaxation or extension. the pi?alleabile of the two and?eno subject one to this phenomenon perch?eno. In effects?uello mainly preferred except when it is magnesium. all.aria nickel when heated or in oxygen, is hardened for solid, falls like submicroscopico MgO oxide for the spread dell.ossigeno from the surface towards l.interno to one velocit?i?levata of that one of spread of the Mg towards l.esterno. dispersed particles, comes added in order to inhibit the increase of enough malleable grains alla., leggermente pi?ure that l.argento pure and are. L.indurimento for oxidation doubles the propriet?eccaniche and the hardened alloy not to pu?itornare to its conditions originates them. Along heating to high temperature in reducing conditions it allows to recover some point in malleabilit?possono being hardened to temperatures that go from the 650 to the 800 C in air (not. Temperatures pi?asse would demand times pi?unghi. can produce changes determine the proportions them excessive, reduced and/or low resistance. The typical uses come indicate to you from the same name that is for dentale cloggings or in order to reconstruct the teeth umidit? from the hands or the apparatuses in order to stir) added during l.amalgamazione cause an excessive expansion of the alloy mercury in the alloy cause creep or successive sliding all.impaccamento. deposition in situ or during l.amalgamazione reduces or eliminates l.aggiustamento. produces an increase of velocit?i the corrosion and reduces the propriet: to pu?resentare one light corrosion or oxidation. The contact with other metals to pu?ortare to: l.amalgama?atta stirring to ambient temperature, 5 parts of the alloy to 65 % Ag (under particle shape) with one quantit?ariabile from 5 to 8 of. A part of spremuta mercury?oi outside during l.impaccamento in order reducing the mercury content approximately to 50 % dell.iniziale. Fragile?bbastanza would absolutely have to avoid contaminations from umidit?prima dell.indurimento later on and to pu?ssere worked. It follows a table with the main propriet?eccaniche and subject to creep when they are not loaded. to jam reaction of ambient spread gives one velocit?i creep of 2. during the hardening for one to temperature.