What are the advantages and necessity of measuring the embryonic density of magnetic material?

What are the advantages and necessity of measuring the embryonic density of magnetic material?

1, field technicians can adjust the value of the embryo density measured to adjust the amount of powder in the mold is sufficient.

2. It can be predicted that the reaction of volatile oxides such as zinc oxide is completed in the sham-fired project to avoid non-uniform dimensional shrinkage.

3, to avoid the formation of embryos sintered through the sintering furnace, the volume generated by the contraction, expansion and deformation and cracking phenomenon.

4, can reduce the waste rate of waste in the cost.

5. It can avoid the decrease of magnetic flux density due to the unevenness of raw embryo density.

the reason:

The difference between the sintered density of the magnetic material and the green density before sintering is quite large. This shrinkage due to the growth of the particles due to the bonding between the particles during sintering. If the density of the embryo formed by the powder is not measured, there is a possibility that the sintered product may be deformed due to shrinkage, thereby wasting raw materials and costs.

The embryos of the metal powder formed by the press are porous embryos. Once immersed in water, this embryo will exhibit disintegration. Causes great difficulties in testing and inaccuracies in testing.

International standards:

The sintered density of the magnetic material and the green density before sintering are both porous products. Its density is determined according to the ASTM B311 and MPIF Standard 42 and JIS Z2505 and GB/T 5163 guidelines, with "body density" as the standard. Bulk Density is the product of general powder molding. It contains the measured density of closed pores and open pores in the object to be measured. Therefore, it is absolutely impossible to let the liquid penetrate into the open pores.

Special design:

Matsukawa's GP-300S in Taiwan is designed to meet the needs of magnetic materials customers, and we give the program innovation. Suitable for the test method that the factory wants.

1. Reasons for using silicone oil instead of water: GP-300S is a scale for rapid test

Advantages: Silicone oil is a viscous liquid. When the sample is placed in a viscous silicone oil, the density has been measured when the silicone oil penetrates into the pores.

Disadvantages: Sticky liquids give the operator considerable inconvenience.

2. Reasons for using mercury instead of water: The solution of GP-300S can be set to a value of 19.999.

Advantages: Mercury is a chemical element. It is a silver-white liquid metal with large cohesion. It is an ideal medium for density testing of porous products. The specific gravity of mercury is 13.5 g/cm3.

Disadvantages: Mercury is toxic. (Requires perfect exhaust and filtration equipment)

3, the use of kerosene instead of water reasons: GP-300S solution compensation can be set to the desired value

Advantages: Formed embryos do not exhibit disintegration.

Disadvantage: The measured density result is the wet density. Its value will be greater than the bulk density, and the manufacturer must control it.

Another option:

Saturated oil test using international standards: MH-300I Professional Specific Balance