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The significance of measuring the density of green body

Release time:2019-12-12 From: Zhengnai Industry in China

There are 2 reasons why the length is not up to standard.

Reasons for the length of the substandard: 1. The length of the green body is incorrectly measured. 2. The control valve and the cutter operating mechanism are malfunctioning, so the cut is too long or too short. Green bodies that do not meet the allowable deviation of length should be disposed of as waste.

Graphite elctrode is our guarantee

Our products can pass all kinds of tests, and the quality is also our selling point. So you can rest assured that the purchase. If there is anything unclear, our professional staff will answer it for you

Waste due to damage

The damage is caused by falling pieces, missing edges, falling corners, and the green body is broken by the external force, or partially broken, and does not meet the waste caused by the dimensional tolerance.

The significance of measuring the density of green body

Measuring the green density can understand the molding quality of the green body, and the green density is low, indicating that there are many pores inside the green body, and the green body is not compacted.

There are 7 types of defects in green body

  • 1. Crack.
  • 2. Pockmarks.
  • 3. Dip.
  • 4. Bending and deformation.
  • 5. The length is not up to standard.
  • 6. Touch damage.
  • 7. Inspection of green density.

There are 3 main factors in the production of defects in green bodies.

  • 1. The process is unstable,
  • 2. The device is defective,
  • 3. The operator has low technical quality and little experience, and cannot judge the abnormality in production and take correct measures in time.

Roasting definition

Calcination is a process in which a green product of a carbon product is placed under a protection of a filler and charged into a specially designed heating furnace for high-temperature heat treatment to carbonize the coal pitch in the green body.

Better performance of charcoal after roasting

The calcined carbon product has high mechanical strength, low electrical resistivity, good thermal stability and chemical stability.

Index of graphite electrode

Item Unit RP HP
300-500mm 550-800mm 300-500mm 550-700mm
Electric resistivity Electrode μΩm 7.5-8.6 7.5-8.8 5.5-6.8 5.5-7.0
Nipple 4.5-6.0 4.0-5.5
Bending strength Electrode Mpa ≥7.5 ≥6.5 ≥10.0 ≥8.5
Nipple ≥16.0 ≥18.0
Elastic modulus Electrode Gpa ≤9.0 ≤13.0
Nipple ≤13.0 ≤15.0
Bulk density Electrode g/cm3 1.54-1.62 1.62-1.70
Nipple 1.70-1.78 1.72-1.80
CTE(100-600℃) Electrode 10-6/℃ 2.20-2.60 1.80-2.20
Nipple 1.50-1.90 1.50-1.80
Ash % ≤0.3 ≤0.3