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4j29 Strip 0.2mm*95mm Precision Expansion Alloy Iron-Nickel Alloy Permalloy Coil / Foil1
Nickel Alloy, Kovar Strip, 4j29 Strip
Ohmalloy Material Co., Ltd.
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Product Description 4J29 strip 0.2mm*95mm Precision expansion alloy Iron-Nickel Alloy permalloy coil / foilOHMALLOYOhmAlloy-4J29 (Expansion alloy)(Common Name: Kovar, Nilo K, KV-1, Dilver Po, Vacon 12)OhmAlloy-4J29 also known as Kovar alloy. it was invented to meet the need for a reliable glass-to-metal seal, which is required in electronic devices such as light bulbs, vacuum tubes, cathode ray tubes, and in vacuum systems in chemistry and other scientific research. Most metals cannot seal to glass because their coefficient of thermal expansion is not the same as glass, so as the joint cools after fabrication the stresses due to the differential expansion rates of the glass and metal cause the joint to crack.OhmAlloy-4J29was invented to meet the need for a reliable glass-to-metal seal, which is required in electronic devices such as light bulbs, vacuum tubes, cathode ray tubes, and in vacuum systems in chemistry and other scientific research. Most metals cannot seal to glass because their coefficient of thermal expansion is not the same as glass, so as the joint cools after fabrication the stresses due to the differential expansion rates of the glass and metal cause the joint to crack. OhmAlloy-4J29 not only has thermal expansion similar to glass, but its nonlinear thermal expansion curve can often be made to match a glass, thus allowing the joint to tolerate a wide temperature range. Chemically, it bonds to glass via the intermediate oxide layer of nickel oxide and cobalt oxide; the proportion of iron oxide is low due to its reduction with cobalt. The bond strength is highly dependent on the oxide layer thickness and character. The presence of cobalt makes the oxide layer easier to melt and dissolve in the molten glass. A grey, grey-blue or grey-brown color indicates a good seal. A metallic color indicates lack of oxide, while black color indicates overly oxidized metal, in both cases leading to a weak joint. Mainly used in electric vacuum components and emission control, shock tube, igniting tube, glass magnetron, transistors, seal plug, relay, integrated circuits lead, chassis, brackets and other housing sealing. Normal composition%Ni28.5~29.5FeBal.Co16.8~17.8Si≤0.3Mo≤0.2Cu≤0.2Cr≤0.2Mn≤0.5C≤0.03P≤0.02S≤0.02 Tensile Strength, MPaCode of conditionConditionWireStripRSoft≤585≤5701/4I1/4 Hard585~725520~6301/2I1/2 Hard655~795590~7003/4I3/4 Hard725~860600~770IHard≥850≥700 Typical Physical propertiesDensity (g/cm3)8.2Electrical resistivity at 20oC(Om*mm2/m)0.48Temperature factor of resistivity(20oC~100oC)X10-5/oC3.7~3.9Curie point Tc/ oC430Elastic Modulus, E/ Gpa138 Coefficient of expansionθ/oCα1/10-6oC-1θ/oCα1/10-6oC-120~607.820~5006.220~1006.420~5507.120~2005.920~6007.820~3005.320~7009.220~4005.120~80010.220~4505.320~90011.4 Thermal conductivityθ/oC100200300400500λ/ W/(m*oC)20.621.522.723.725.4 The heat treatment processAnnealing for stress reliefHeated to 470~540oC and hold 1~2 h. Cold downannealingIn vacuum heated to 750~900oCHolding time 14 min~1h.Cooling rateNo more than 10 oC/min cooled to 200 oC Style of supplyAlloys NameTypeDimension OhmAlloy-4J29WireD= 0.1~8mm OhmAlloy-4J29StripW= 5~250mmT= 0.1mmOhmAlloy-4J29FoilW= 10~100mmT= 0.01~0.1OhmAlloy-4J29BarDia= 8~100mmL= 50~1000 FAQ1. What's the minimum quantity customer can order?If we have your size in stock, we can provide any quantity you want.If we do not have, for spool wire, we can produce 1 spool, about 2-3kg. For coil wire, 25kg.2. How can you pay for small sample amount?We have Western union account, wire transfer for sample amount also ok.3. Customer do not have express account. How will us arrange the delivery for sample order?Just need to provide your address information, we will check the express cost, you can arrange the express cost together with sample value.4. What's our payment terms?We can accept LC T/T payment terms, it also depending on delivery and total amount. Let's talk more in details after getting your detailed requirements.5. Do you provide free samples?If you want several meters and we have stock of your size, we can provide, customer need to bear the International express cost.6. What's our working time?We will give you reply through email/phone Online contact tool within 24 hours. No matter working day or holidays.
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