|
Resistance wire is wire intended for making electrical resistors.〔http://www.pelicanwire.com/products/resistance-wire/〕 It is desirable that the chosen alloy have high resistivity, as a shorter wire can then be used. In many situations the stability of the resistor is of primary importance, and thus the alloy's temperature coefficient of resistivity and corrosion resistance. When resistance wire is used for heating elements (in electric heaters, toasters, and the like), high restivity and oxidation resistance is important. Sometimes resistance wire is insulated by ceramic powder and sheathed in a tube of another alloy; such heating elements are used in electric ovens and water heaters and in specialized forms for cooktops. ==Types== Nichrome, a non-magnetic 80/20 alloy of nickel and chromium, is the most common resistance wire for heating purposes because it has a high resistivity and resistance to oxidation at high temperatures. When used as a heating element, resistance wire is usually wound into coils. One difficulty in using nichrome wire is that common tin-based electrical solder will not stick to it, so the connections to the electrical power must be made using other methods such as crimp connectors or screw terminals. Kanthal (Alloy 875/815), a family of iron-chromium-aluminium (FeCrAl) alloys used in a wide range of high-temperature applications. Constantan () has a low temperature coefficient of resistivity and as a copper alloy, is easily soldered. Other constant-resistance alloys include manganin (), Cupron ()〔https://www.cartech.com/ssalloysprod.aspx?id=1940 Carpenter Technology, CBX Cupron® Alloy 〕 and Evanohm. The Evanohm family of nickel-chrome alloys (),〔http://cartech.ides.com/datasheet.aspx?I=101&TAB=DV_DS&E=26 Carpenter Technology, Evanohm Alloy S〕 (),〔http://cartech.ides.com/datasheet.aspx?I=101&TAB=DV_DS&E=27 Carpenter Technology, Evanohm Alloy R〕 have high resistance, low temperature coefficient of resistance, low electromotive force (Galvani potential) when in contact with copper, high tensile strength, and also are very stable with regards to heat treatment. Balco () and similar alloys have very high, but more linear, temperature coefficient of resistivity, making them suitable for sensing elements. Many elements and alloys have been used as resistance wire for special purposes. The table below lists the resistivity of some common materials. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Resistance wire」の詳細全文を読む スポンサード リンク
|