Product Description
Kovar (also known as 4J29) is a nickel-iron alloy that exhibits a unique combination of low thermal expansion and good mechanical properties. It is widely used in applications where a close match of thermal expansion characteristics with materials like glass or ceramics is required. Kovar has a coefficient of thermal expansion (CTE) that is similar to that of borosilicate glass, making it ideal for sealing metal-to-glass components, such as in electronic and vacuum tube industries.
Key Features
- Low Thermal Expansion: Excellent dimensional stability across temperature changes, especially when used with glass and ceramics.
- Strong and Tough: Good mechanical strength and toughness at both ambient and elevated temperatures.
- Good Weldability: Allows for easy joining with other materials, especially in electronic components.
- Magnetic Properties: Magnetic behavior makes it suitable for specific applications in electronics.
Chemical Composition
| Element |
Percentage (%) |
| Nickel (Ni) |
29.0 - 35.0 |
| Iron (Fe) |
Balance |
| Cobalt (Co) |
0.30 max |
| Manganese (Mn) |
0.50 max |
| Silicon (Si) |
0.30 max |
| Carbon (C) |
0.02 max |
| Phosphorus (P) |
0.015 max |
| Sulfur (S) |
0.015 max |
Specifications
- UNS Number: K94610
- Available Forms: Plate, Sheet, Coil, Strip, Wire, Rod, Tube
- Standards:
- ASTM F15
- ASTM A333
- MIL-DTL-3922
Applications
- Glass-to-Metal Seals: Used for manufacturing hermetically sealed electronic components, such as vacuum tubes and semiconductors.
- Electronics: Essential for packaging in devices like transistors, diodes, and integrated circuits.
- Aerospace: Often used in specialized sealing applications.
- Medical: Sealing of components in medical devices requiring stable thermal properties.
Mechanical Properties
| Property |
Value |
| Tensile Strength |
500 MPa (min) |
| Yield Strength |
350 MPa (min) |
| Elongation |
25% (min) |
| Hardness |
180 HBW (max) |
Fabrication and Machining
- Weldability: Kovar can be welded with methods such as TIG, MIG, and laser welding. It requires careful control of heat to avoid material distortion.
- Machining: Can be machined using conventional tools. Its strength allows for precision machining, particularly in high-tolerance applications.
- Forming: Suitable for cold and hot forming, but care should be taken to avoid work hardening.
Advantages
- Thermal Expansion Match: Exceptional for use in metal-to-glass seals, ensuring that components do not crack or break when exposed to temperature changes.
- Durability and Strength: Excellent resistance to wear, making it ideal for high-stress applications.
- Versatile: Used in numerous industries, including electronics, aerospace, and medical devices, for its unique combination of properties.
Detailed Photos
Company Profile
Shandong Titanium Nickel Special Steel Co., Ltd., registered funds (one thousand yuan for 10,000 yuan), the company is mainly committed to high -tech enterprises that are integrated with special alloy materials, specializing in the research and sales of special alloys such as nickel -based and iron -based. Products include corrosion-resistant alloys, superalloys, precision alloys, Hastelloy, Monel, INCONEL, INCOLOY, copper-nickel alloys, titanium and titanium alloys, zirconium and zirconium alloys, nickel and nickel-based alloys, nickel-cobalt-based heat-resistant alloys , Hafnium alloy, etc., more than 60 kinds of alloy materials such as special stainless steel. On the basis of stabilizing the quality of the original products, according to the market demand, it solves the quality problems existing in the traditional metallurgical process, and ensures the low miscellaneous and low deflection of the alloy material products, which has won an excellent reputation in the industry.
Factory workshop
Product application
Packaging & Shipping
FAQ
1: What is precision alloy?
Precision alloys refer to special alloys with high purity, uniformity and stability. They are usually used to manufacture parts or components that have extremely strict size, shape and performance requirements. They have special physical properties (such as magnetic, electrical, thermal, etc.) and chemical properties to meet specific engineering requirements.
2: What are the main types of precision alloys?
Precision alloys can be divided into many types according to their different physical properties, mainly including:
Magnetic alloys: Such as soft magnetic alloys and permanent magnetic alloys (hard magnetic alloys).
Elastic alloy: An alloy that can deform reversibly under certain stress or temperature conditions.
Expansion alloy: An alloy with a large linear expansion coefficient within a certain temperature range.
Thermal Bimetal: A composite material composed of two or more metallic materials that exhibit different thermal expansion properties.
Resistive Alloys: Alloys with stable resistivity and constant temperature coefficient of resistance.
Thermoelectric alloy: Alloy with thermoelectric effect.
Hydrogen storage alloy: An alloy with hydrogen storage function.
Shape memory alloy: Alloys with shape memory effect.
Magnetostrictive alloy: A type of metal material with magnetostrictive effect.
3: What are the main application areas of precision alloys?
Precision alloys are widely used in aerospace, automobiles and trains, energy and chemicals, medical equipment, electronics industry, fasteners and other fields. For example, in the aerospace field, precision alloys are used to manufacture aircraft engines, aviation structural parts, missiles, etc.; in the automotive and train field, they are used to manufacture engines, transmission systems, chassis components, tracks, wheels, etc.
4: What is the production process of precision alloy?
The production process of precision alloys includes the selection and pretreatment of alloy raw materials, smelting and casting, heat treatment and processing technology, as well as surface treatment and performance testing. The entire production process requires precise control of each link to ensure that the composition and performance of the alloy meet the requirements.
5: How to detect the quality of precision alloy?
Quality testing of precision alloys is mainly through chemical analysis and physical property testing. Commonly used testing methods include spectral analysis, tensile testing, hardness testing and low-temperature impact testing to ensure that each batch of alloys can meet predetermined technical requirements.
6: What are the significant advantages of precision alloys?
Advantages of precision alloys include:
Has unique physical properties, such as excellent electrical conductivity, thermal conductivity and magnetism.
Excellent mechanical properties, high strength, wear resistance and good elasticity.
Strong corrosion resistance and long service life.
Stable performance in a wide temperature range and wide application.
It has good processing performance and is easy to manufacture precisely.
The ingredients and organization are controllable to meet diverse needs.
7: What kind of performance does precision alloy show in a magnetic field?
Magnetic alloys in precision alloys exhibit excellent magnetic properties in magnetic fields. For example, soft magnetic alloys have high magnetic permeability and low coercivity, are easy to demagnetize, and have low energy loss during cyclic magnetization, making them indispensable materials in electromagnetic equipment.
8. How can I contact you for more information?
You can contact us through the following methods
Online support: Visit our website for live chat
Address: 300 Meters North of Liaoniu Road and Xindong Ring Road, Liaocheng High-Tech Zone, Liaocheng, Shandong, China
We look forward to providing you with high-quality products and services!
If you have any other questions, feel free to contact us, and we will do our best to assist you!
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