Discussion
Arrange the following in order of increasing typical powder cost per kilogram.
1. coprecipitated zirconia
2. mined ball clay
3. sol-gel derived nanopowder
4. Acheson silicon carbide
Answer: A
Correct answer: 2 - 4 - 1 - 3
Cost rises with how much processing separates the product from the ground. Mined ball clay is dug, blended and shipped. Acheson silicon carbide is made in an electric furnace from cheap sand and coke, so it is inexpensive despite the energy. Coprecipitated zirconia requires solution chemistry, washing, drying and calcination. And a sol-gel nanopowder adds alkoxide precursors on top of all of that.
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