29HK-BЍ MIM Parts

29HK-BЙ Introduction of Metal Injection Molding Parts

4J29 alloy is also known as 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.

Comparison table of the same foreign brands

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.

29HK-BЙ Basic situation of metal injection molding parts

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

2. 29HK-BЍ MIM parts material standard: ISO, GB, ASTM, SAE, EN, DIN, BS, AMS, JIS, ASME, DMS, TOCT, GB

3. Main processes: 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.

Physical Properties

Average Linear Expansion Coefficient

Thermal expansion

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%.

● The performance test samples for the expansion coefficient and low temperature microstructure stability specified in the 4J29 heat treatment system standard are heated to 900℃±20℃ in a hydrogen atmosphere, kept for 1 hour, then heated to 1100℃±20℃, and kept for 15min, with a temperature not greater than Cool down to below 200°C at a rate of 5°C/min.

● 4J29 Variety Specifications and Availability Varieties include wire, strip, plate, tube and bar.

● 4J29 Melting and Casting Process Melting in non-vacuum induction furnace, vacuum induction furnace or electric arc furnace.

● 4J29 application overview and special requirements This 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.

4J29 Physical and chemical properties

● 4J29 Thermal Properties

4J29 Melting temperature range The melting temperature of this alloy is about 1450 ℃.

● 4J29 Thermal Conductivity See Table 2-1.

Table 2-1

● 4J29 Specific Heat Capacity At 0℃, the specific heat capacity is 440J/(kg•℃); at 430℃, the specific heat capacity is 649J/(kg•℃).

● 4J29 coefficient of linear expansion standard stipulates α1(20～400℃)=(4.6～5.2)×10-6℃-1; α1(20～450℃)=(5.1～5.5)×10-6℃-1 (when When used in transistors, the upper limit is 5.6×10-6℃-1).

● 4J29 resistivity ρ=0.48μΩ·m.

Table 2-2

● 4J29 The temperature coefficient of resistance is shown in Table 2-3.

Table 2-3

● 4J29 Magnetic Properties

4J29 Curie point Tc=430℃.

The magnetic properties of 4J29 alloy are shown in Table 2-4.

At 4000A/m, the residual magnetic induction intensity Br=0.98T, and the coercive force Hc=68.8A/m.

● 4J29 chemical properties The alloy has good corrosion resistance in the atmosphere, fresh water and sea water.

Table 2-4