Has been used in applications such as radio and electronic devices where dimensional changes due to temperature must be minimal, as well as in support and structural members in precision optical laser. Kovar is generally very stable down to low temperatures. Kovar f15 alloy is not hardenable by heat treatment. Leng and others published preoxidation of kovar alloy for hermetic sealing find, read and cite all the research you need on researchgate. Alloy k kovar is available further details in bar, rod, tube, sheet, strip, coil, plate and wire. Kovar is one of numerous metal alloys sold by american elements under the trade name ae alloys. Controlled expansion alloys kovar, invar 36, 42 alloy. Artificial aging with gradual heat treatment stabilizes the expansion coefficients in a selected temperature range.
The related particular feni alloy invar exhibits minimum thermal expansion. We provide kovar materials and all high purity materials to all industries we serve. Controlled and low expansion alloys astm f15 or kovar, invar 36, alloy 42, alloy 46, alloy 48, alloy 52 for glass to metal or galss to ceramic sealing applications in forms such as rod, coil, strip, plate, sheet from ed fagt. Kovar alloy properties astm f15, nilo k, pernifer 2918, rodar, and dilvar p1 kovar alloy physical properties density lbcu in 0. Thus kovar finds wide usage in the electronics industry for metal parts bonded to hard. Astm f15 alloy is a controlled expansion alloy consisting of 29%. Thus kovar finds wide usage in the electronics industry for metal parts. A 36% nickeliron alloy with a rate of thermal expansion approximately onetenth that of carbon steel at temperatures up to 400f 204c. Generally immediately available in most volumes, ae alloys are available as bar, ingot, ribbon, wire, shot, sheet, and foil.
First, the kovar alloy underwent preoxidization treatment at three different temperatures 700, 800 and 900 c and for seven different isothermal holding periods 0, 3, 5, 10, 15, 30 and 60 min. Therefore, the deviation of xray fluorescence parameters in present alloys with respect to the pure metal have increased with increment in superposition 3d electron numbers of. Efi carries kovar astm f15 42 alloy 46 alloy 48 alloy 52 alloy. Despite its relatively long history, many people outside of engineering fields may never have heard of this valuable alloy. Kovar astm f15 foil and sheet to mil i 23011c class 1 coil thicknesses slit to your specific size special sizes on request. In the annealed condition, invar is more difficult to machine because it is soft and gummy. In power tubes, microwave tubes, transistors, diodes, intergrated circuits and has been used for the flat pack and the dualinline package. It is a nickel iron alloy with 29% nickel, 17% cobalt and the remaining balance is iron. Material compliant to sae ams i23011 class 1 and astm f15. This page is mainly introduced the kovar datasheet, including chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and micro structure, etc. Astm f15 alloy 2917 kovar alloy description alloy 2917is ironnickelcobalt, low expansion alloy whose chemical composition is controlled within narrow limits to assure precise uniform thermal expansion properties. Ultra high purity and high purity forms also include metal powder, submicron powder and nanoscale, targets for thin film deposition, and pellets for chemical vapor. Jul 12, 2019 pins are tinplated kovar, alloy 42 or copper package material is plastic pins are intended for insertion in hole rows on. Available forms are seamless pipe, welded pipe, seamless tube, welded tube, bar, wire, sheet, plate, forgings, pipe fittings and flanges.
Astm f15 alloy or kovar is a controlled expansion alloy consisting of 29% nickel, 17% cobalt, and balance iron. For all stock availability contact sales for further availability. Astm f15 alloy, commonly known as kovar, is a controlled expansion alloy consisting of 29% nickel, 17% cobalt, and balance iron. Kovar alloy is a vacuum melted, fenico, low expansion alloy whose chemical composition is controlled within narrow limits to assure precise uniform thermal. Carpenter kovar alloy glass and ceramic sealing alloy. The expansion characteristics of kovar match both borosilicate pyrex glass and alumina ceramics, making it one of the most. Kovar is a nickelcobalt ferrous alloy compositionally identical to fernico 1, designed to have. Also known as astm f15, nilo k, pernifer 2918, rodar, and dilver p1 specific gravity. Item standard number descriptions 1 sae ams 7727e 2000 ironnickelcobalt alloy, bars and forgings, 53fe 29ni 17co, low. Super alloy kovar is an ironbased alloy with nickel and cobalt. The expansion characteristics of kovar match both borosilicate or pyrex glasses and alumina ceramics, making it one of the most popular of the controlled expansion. The annealed hardness for invar alloy is typically around rb 7080, whereas the 14 h to 12 h range for invar, can run in the range rb 8096.
The following sections will discuss in detail about super alloy kovar. Kovar alloy properties kovar is an ironnickelcobalt alloy with a coefficient of thermal expansion similar to that of hard borosilicate glass. In intergrated circuits, it has been used for the flat pack and the dualinline package. This alloy has found wide application in power tubes, microwave tubes, transistors and diodes. This alloy is a controlled expansion alloy uses for ceramic and glass metal seals. Vdm alloy 36 is a binary ironnickel alloy with a particularly low heat expansion coefficient, whereby the levels of carbon and manganese as well as freedom of impurities are significant. Alkali borosilicate glasses are also often referred to as hard glasses and are a popular choice in the electronics industry for producing hermetic glasstometal. Ausn solder alloy and its applications in electronics packaging tao zhou1, tom bobal1, martin oud1 and jia songliang2 1coining, inc. Tooling tends to plow the material instead of cleanly cutting into it, and does not easily form chips. Tensile and hardness data for samples annealed 1830f 999c 30 min. Availability alloy k kovar is available further details below in bar, rod, tube, sheet, strip, coil, plate and wire. The chemical composition of kovar is outlined in the following table. It is produced to ensure good properties for machining and deep drawing as well as porosity free product.
Download and read any of our strip and wire datasheets below. It is produced to ensure good properties for machining. Kovar is an iron cobalt nickel alloy with a coefficient of thermal expansion like that of hard glass. Kovar has been used in power tube, microwave tubes, diodes and transistors. Alloy 2917 kovarhas been used for making hermetic seals with the harder pyrex glasses and ceramic materials. Kovar is an ironnickelcobalt alloy with a coefficient of thermal expansion similar to that of hard borosilicate glass. This alloy is designed to adapt to computer, microwave, hydrid, semiconductor and space age technology demands, thus, making this an essential resource to the. The physical properties of super alloy kovar are tabulated below. Alloy astm f15 aka 1kovar controlled expansion alloys. Has been used in applications such as radio and electronic devices where dimensional changes due to.
Thus kovar finds wide usage in the electronics industry for metal parts bonded to hard glass envelopes for. Kovar kovar is an ironnickelcobalt alloy with a coefficient of thermal expansion similar to that of hard borosilicate glass. It also contains the use of kovar,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application. Comprised of nickel, cobalt and iron, astm f15 alloy kovar is designed to cope with computer, microwave, hybrid, semiconductor and space age technology demands.
The uses and uniqueness of kovar eagle alloys corporation. This nickeltitanium alloy remembers its original, coldforged shape. The name kovar is often used as a general term for feni alloys with these particular thermal expansion properties. Pdf preoxidation of fenico kovar alloy for glass to. Kovar alloy wire is a nickel iron alloy suitable for glass and ceramic sealing to metal. Consists largely of the solidsolution nickelchromiumiron alloys, which are similar to the austenitic stainless steels. Alloy 2917 kovar, uns k94610 shaped, flat, square, round, fine wire, plated and unplated speci. Kovar alloy is a vacuum melted, ironnickelcobalt, low expansion alloy whose chemical composition is controlled within.
Astm f15 alloy kovar is a controlled expansion alloy most commonly used for high integrity glass and ceramic to metal seals, lids, lead frames and electronic package base. In the annealed condition, kovar f15 alloy is more difficult to machine. Kovar alloy, astm f15, nilo k, pernifer 2918, rodar and. Controlled expansion alloys kovar, invar 36, 42 alloy, 46. Its coefficient of expansion, which decreases with rising temperature to the inflection point, matches the expansion rate of borosilicate glasses and alumina ceramics. Pins goldplated nickel alloy datassheet leads are goldplated kovar eight leads thru 15 mil kovar header package weight is 1. This makes it especially suitable for uses which require a matchedexpansion seal between metal and glass parts. Alloy 2917is ironnickelcobalt, low expansion alloy whose chemical composition is. The annealed hardness is up to rb 85 max, increasing up to rb 96 for half hard.
Kovar titanium al68sic aluminium ce17 ce7 thermal conductivity wmk kovar titanium alumina ce7 al68sic ce17 85w15cu aluminium 5 10 15 20 25 5 10 15 20. Since kovar alloy is tough and versatile, while employing extensive quality controls throughout uns k94610 alloys manufacturing process to ensure uniform physical and mechanical properties for ease in deep drawing, stamping and machining are consistently achieved. Invar alloy can not be hardened by heat treatment but through cold working only. Ausn solder alloy and its applications in electronics. Kovar is produced to ensure good properties for machining and deep drawing as well as porosity free product. This alloy has found wide use in application where high reliability is a necessity. Socket boards for the ultraviolet eraseable devices are also available. Astm f15, astm f15, 2917 alloy, data provided by carpenter technology corporation. Alloy 52, uns n14052 shaped, flat, square, round, fine wire, plated and bare wire astm f30 alloy 52 description alloy 52 was developed for glasstometal seals for some of the soft glasses and ceramics. Investigation of alloying effects on xrf parameters of 3d. Kovar 1 aka astm f15, pernifer 2918 2, dilvar p1 3 and nilo k 4 is a controlled expansion alloy.
Pins are 74ls04pcc 52 pins 1 and 2 electrically isolated from case is third electrical connection copper base with soldered in pins aluminum cap package weight is in addition, the dma contains a bit memory address bus, an 8. In the annealed condition, kovar f15 alloy is more difficult to machine because it is soft and gummy. Kovar is produced to deal with microwave, semiconductor, computer and other aerospace and space applications. Fe a low expansion alloy which has been widely used for making hermetic seals with the harder pyrex glass and ceramic materials such as in power tubes, microwave tubes, transistors, and. Kovar alloy k is a nickelironcobalt controlledexpansion alloy containing 29% nickel. Kl obtained values in kovar alloy have shown the most deviation in present alloys, permendur49 follows it and then ti 50 co 50 comes. Introduction soldering is an important technique in the assembly of electronic products. Kovar has been used for making hermetic seals with ceramic materials and glass. These alloys include monel 400, 401, 450, ferry alloy, invar 36, 48, kovar, and inco alloy ms 250. The chemical composition is well controlled so as to provide low, uniform, thermal expansion property for this alloy.
Preoxidation of kovar alloy for hermetic sealing request pdf. Kovar, also known as astm f 15 alloy, is a controlled expansion alloy that is typically applied to high integrity glass and ceramic to metal seals, lids, lead frames and electronic package base. Kovar alloy mechanical, chemical, expansion, and magentic. Kovar alloy, also known as astm f15, nilo k, pernifer 2918, rodar and dilver p1 is a controlled expansion alloy. Very low coefficient of expansion from 100 to 450c. Pins are tinplated kovar, alloy 42 or copper package material is plastic pins are intended for insertion in hole rows on. Saddle brook, nj 07663 usa 2institute of microelectronics, tsinghua university, beijing 84 china 1. Kovar alloy k is used for highpower transmitting valves, transistor leads and headers, integratedcircuit lead frames, and photography flash bulbs.
Kovarrodar is used in industrial manufacturing primarily in medical, electronics and semiconductor fields. Datasheet for steel grades specialsteel kovar kovar standard number. The expansion characteristics of kovar match both borosilicate pyrex glass and alumina ceramics, making it one of the most popular. Kovar alloy has been used for making hermetic seals with the harder pyrex glasses and ceramic materials.
It was specifically developed and formulated as a sealing alloy for ceramic and glass materials due to the compatibility with the thermal expansion characteristics of borosilicate glass. It is commonly used in lead wire for mercury switches and in semiconductor devices. Kovar alloy, a nickelcobaltferrous alloy, is one of the most commonly used glass sealing alloys. Controlled expansion alloys kovar, invar 36, 42 alloy, 46 alloy, 48 alloy, 52 alloy, electronic nickel subject. Jul 12, 20 super alloy kovar is an ironbased alloy with nickel and cobalt. Astm f15 kovar controlled expansion alloy rod, bar, sheet, plate, coil, strip subject. Alloy 2917 kovar, uns k94610 ulbrich stainless steels. This alloy was developed to match the expansion of alkali borosilicate type glasses. Kovar alloy properties materials used in microwaves.
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