Tungsten Carbide Ball National Standard (JBT9145

Continued:

11. Less burning: The sintering temperature of the products is too low or the sintering time is too short to make the product does not meet the required sintering properties.

      12. Stratification: Products compacts or the layered defect in sintered body and the defect itself.

13. Cracks: The irregular interface and shades of cracks in the surface, corner and bottom of products.

14. Impurity: The small pores or inclusions observed in the section of the products by LP (low-powered) microscope.

       15. Porosity: The ratio of total pore volume and the products volume.

       16. Non-combined carbon: The free graphite in the structure of tungsten carbide.

17. Dirt degree: The length is no less than 50 μm and has clear edge, pore observed by 100-100 times metallurgical microscope is called as dirt, which the total length of all the dirt on grinding every square centimeter of (cm²) is called dirt degree.

       18. Some visible pits with bright carbide cutting tools bottom on the surface of tungsten carbide ball.

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