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| Q. |
In direct extrusion process at higher temperature which of the following is used to avoid friction? |
| A. | oil |
| B. | lubricants |
| C. | molten glasses |
| D. | wax |
| Answer» C. molten glasses | |
| Explanation: for steels, stainless steel, and high temperature materials, glass is a good excellent lubrication. the reasons for this are as follows. i. glass contains its viscosity at elevated temperatures, ii. has good wetting characteristics, and 3. glass acts as a thermal barrier between the billet, the container and the die, thus minimizing cooling. | |
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