Vacon12 MIM Parts

Introduction of Vacon12 Metal Injection Molded Parts

Qinhuangdao Zhongwei Precision Machinery Co., Ltd. is a collection of copper alloy metal injection molding, iron-based metal injection molding, stainless steel-based metal injection molding, aluminum alloy metal injection molding, nickel alloy metal injection molding, cobalt alloy metal injection molding, tungsten alloy metal injection molding A comprehensive high-tech enterprise integrating R&D, production and sales of injection molding, cemented carbide metal injection molding, and powder metallurgy structural parts.

Product Introduction

1. Implementation standards: the company strictly implements ISO9001, ISO14001, IATF16949 certification, and products have passed ROHS, FDA EU certification, etc.

2. Vacon12 MIM Parts material standard: ISO, GB, ASTM, SAE, EN, DIN, BS, AMS, JIS, ASME, DMS, TOCT, GB

3. Main process: metal injection molding MIM, powder metallurgy PM, investment casting, die-casting aluminum

4. Available materials for powder metallurgy:

Copper alloys, iron bases, titanium alloys, stainless steel bases, aluminum alloys, nickel alloys, cobalt alloys, tungsten alloys, cemented carbides, hydroxy alloys, soft magnetic materials and 3D printing can be customized according to customer requirements.

Product Description

Vacon12 alloy is also known as Kovar (Kovar) alloy. The alloy has a linear expansion coefficient similar to that of borosilicate hard glass at 20-450°C, a higher Curie point, and good low temperature microstructure stability. The oxide film of the alloy is dense and can be well wetted by glass. It does not interact with mercury, and is suitable for use in meters containing mercury discharge. It is the main sealing structure material of electric vacuum devices.

Kovar alloy Vacon12 is a low-expansion metal of iron, nickel and cobalt melted in vacuum. The chemical composition of Kovar Vacon12 is controlled within a narrow range to ensure precise and uniform thermal expansion properties are maintained at all times. The Vacon12 MIM Parts manufacturing process utilizes high-end quality control aspects to ensure uniform physical and mechanical properties, allowing for ease of deep drawing, stamping and CNC machining of alloy powders to allow more complex parts to be made with the metal injection molding process.

●Similar grades

Russia United States United Kingdom Japan France Germany

29HК Kovar Nilo K KV-1 Dilver P0 Vacon 12

29HК-BИ Rodar KV-2

Techallony Glasseal 29-17 Telcaseal KV-3 Dilver P1 Silvar 48

●Technical standards for materials

YB/T 5231-1993 "Fe-Ni-Co glass sealing alloy 4J29 and 4J44 technical conditions".

●Chemical composition

C≤0.03%

Mn≤0.50%

Si≤0.30%

P≤0.020%

S≤0.020%

Cu≤0.20%

Cr≤0.20%

Mo≤0.20%

Ni=28.5-29.5%

Co=16.8-17.8%

Fe = surplus

Under the condition that the average linear expansion coefficient reaches the standard, the content of nickel and cobalt is allowed to deviate from the range specified in Table 1-2. The content of aluminum, magnesium, zirconium and titanium should not exceed 0.10% each, and the total amount should not exceed 0.20%.

●Heat treatment regime

The performance test samples for the expansion coefficient and low temperature microstructure stability specified in the standard are heated to 900℃±20℃ in a hydrogen atmosphere, kept for 1h, then heated to 1100℃±20℃, and kept for 15min, at a temperature not greater than 5℃/min The speed is cooled to below 200 ℃.

●Application overview and special requirements

The alloy is a typical Fe-Ni-Co hard glass sealing alloy commonly used in the world. It has been used for a long time in the aviation factory with stable performance. It is mainly used for glass sealing of electric vacuum components such as launch tubes, oscillator tubes, ignition tubes, magnetrons, transistors, sealed plugs, relays, integrated circuit lead wires, chassis, shells, brackets, etc. In the application, the selected glass should be matched with the expansion coefficient of the alloy. Strictly test its low temperature tissue stability according to the use temperature. Appropriate heat treatment should be carried out during processing to ensure that the material has good deep drawing properties. When using forgings, their air tightness should be strictly checked.

●Alloy structure

After the alloy is treated according to the heat treatment system specified in 1.5, and then frozen at -78.5 ℃, martensitic structure should not appear for more than or equal to 4h. However, when the alloy composition is not appropriate, different degrees of austenite (γ) to acicular martensite (α) transformation will occur at room temperature or low temperature, and the transformation will be accompanied by volume expansion. The expansion coefficient of the alloy increases accordingly, resulting in a sharp increase in the internal stress of the sealing part, and even partial damage. The main factor affecting the low temperature microstructure stability of the alloy is the chemical composition of the alloy. It can be seen from the Fe-Ni-Co ternary phase diagram that nickel is the main element to stabilize the γ phase, and a high nickel content is conducive to the stability of the γ phase. As the total deformation rate of the alloy increases, its microstructure tends to be more stable. Alloy composition segregation may also cause localized γ→α transformation. In addition, the coarse grains will also promote the γ→α transformation.

Vaconl2Fernico alloy product specifications include:

Density: 0.302 lb/in3

Specific gravity: 8.36 g/cm3

Curie temperature: 435oC/815oF

Melting point: 1450 o C/ 2640 o F

Specific heat: 0.105 cal/g/0 at 00C & 0.155 cal/g/o at 4300C

Thermal conductivity: 17.3 W/m-K

Resistivity: 49 microhm/cm

●Vacon12 application

As a direct Vacon12 material supplier, Shanghai Benlai Metal distributes high-grade Vacon12 alloy products to various industries that must minimize dimensional changes due to temperature changes. Some applications that utilize UNSVacon12 include: seals, Power tubes, microwave tubes, diodes, transistors, X-ray tubes

●Advantages of Kovar Vacon12 products

Expansion Alloy Kovar is precisely formulated and controlled to produce a coefficient of thermal expansion very close to that of hard glass or ceramic, meaning it expands and contracts at similar rates. As such, it is ideal for applications in combination with glass or ceramic materials, especially where hermetic sealing must be maintained over a wide temperature range. Other key advantages of Vacon12 include:

Very low coefficient of thermal expansion (CTE)

Metal stamping capacity

Advanced Dimensional Stability

●Vacon12 and thermal expansion coefficient

The iron-cobalt-nickel alloy Vacon12 is precisely formulated and controlled to produce a coefficient of thermal expansion very close to that of hard glass or ceramic, meaning it expands and contracts at similar rates. This material is ideal for applications requiring glass-to-metal sealing, especially where hermetic sealing must be maintained over a wide temperature range.