Types of Graphite Tubes – What Distinguish Each from Other?
The tube graphite is mostly used in the chemical process equipment industry. It has three different types;
- Resin-bonded Graphite
- Carbon bonded graphite
- fully graphitized
Each type has specific features and cost consequences that must be pondered for each particular application.
Resin Bonded Graphite Tube
This type of graphite tube consists of graphite flour mixed with a resin binder, which is then extruded to the required size. The greater percentage of resin results in a non-porous tube, which doesn’t need an additional resin impregnation step. After extrusion, the tube is baked at 250 Degree C and then cut to length. The highlighting benefit of resin bonded tube is its cost which can fall as lower as ½ that of a partly graphitized or fully graphitized tube.
It should be considered in certain applications. In any case, in higher temperature, more destructive applications it can encounter consumption and will have extraordinarily diminished working life contrasted with the other two famous cylinder contributions.
The gum reinforced cylinder has low adaptability (higher weakness), higher warm extension rate, and extraordinarily diminished warm conductivity. The mix of these last three properties brings the cylinders’ capacity down to withstand mechanical and warm stun.
Carbon Bonded Graphite Tube
The carbon bonded graphite can said to be a combination of resin, graphite flour, and lubricants; all are extruded together to form the tube. It is then subjected to a certain range of temperature around 1200 deg C, this results in making a tube that contains both graphite and amorphous carbon
As compared to a fully graphitized tube, the lower processing temperature reduces energy cost, and wear & tear on the furnace. Thus, it could be a reasonable tube as compared to fully graphitized. The carbon bonded graphite tube typically features 8-10% porosity. It is caused impenetrable in a phenolic sap to heat/treat measure. Contrasted with the sap reinforced cylinder it has better warm properties and improved obstruction than warm and mechanical stun.
Contrasted with the completely graphitized tube the presence of indistinct graphite builds the warm development rate and brings down the cylinders’ sturdiness, malleability, and warm conductivity. The outcome is lower warm stun opposition and protection from weakness disappointment because of cylinder vibration.
Fully Graphitized Tube
Lastly, there comes a fully graphitized tube – tube graphite - is used in the same basic raw materials as carbon bonded graphite tube. The highlighting difference comes in tube forming. The tube undergoes graphite process at 2800 Degree Centigrade in a graphitizing furnace. This step removes all vague carbon. It is porous with 10-12% permeability and requires a resin bake/treat cycle to make it more impervious.
It's completely graphitized structure brings about unrivaled warm properties, including the most noteworthy warm conductivity, least warm development rate, amazing exhaustion obstruction, and improved adaptability and flexibility comparative with the other two-cylinder alternatives.
It is the more impervious to warm and mechanical stun, exhaustion disappointment, and commonly offers longer operational life dependent on the existing pattern of graphite measure gear.
