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Chapter 13: Problem 23

Cite one reason why drying shrinkage is greater for slip cast or hydroplastic products that have smaller clay particles.

Short Answer

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Answer: Drying shrinkage is greater for slip cast or hydroplastic products with smaller clay particles because they have a larger surface area, which allows for stronger bonding between particles and increased water absorption. As the product dries, more water must be removed from the mixture with smaller particles compared to mixtures with larger particles, causing the clay product to experience greater drying shrinkage as more water is displaced and the clay particles come closer together.

Step by step solution

01

Understanding drying shrinkage and clay particles

Drying shrinkage occurs when a clay product dries and loses water, causing the clay particles to come closer together and ultimately contract in size. Slip casting and hydroplastic processes involve mixing clay particles with water to create a fluid or moldable medium. Clay particles can vary in size, with smaller particles often producing the desired properties for ceramics and other applications.
02

Properties of small clay particles

Smaller clay particles have a larger surface area compared to larger particles, even if the overall volume of clay remains the same. This results in stronger bonding between the particles as well as increased water absorption due to the corresponding increase in surface area available for water to interact with the clay.
03

Greater drying shrinkage in small clay particles

Since smaller clay particles have a greater surface area, they also hold more water within the slip cast or hydroplastic mixture. As the product dries, more water must be removed from the mixture compared to mixtures with larger particles. As a result, the clay product with smaller particles experiences greater drying shrinkage as more water is displaced and the clay particles come closer together.

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Most popular questions from this chapter

Compare the manner in which the aggregate particles become bonded together in clay-based mixtures during firing and in cements during setting.

(a) What are the three main components of a ( whiteware ceramic such as porcelain? (b) What role does each component play in the forming and firing procedures?

(a) Why is it so important to control the rate of drying of a ceramic body that has been hydroplastically formed or slip cast? (b) Cite three factors that influence the rate of drying, and explain how each affects the rate.

Glass pieces may also be strengthened by chemical ( tempering. With this procedure, the glass surface is put in a state of compression by exchanging some of the cations near the surface with other cations having a larger diameter. Suggest one type of cation that, by replacing \(\mathrm{Na}^{+}\), induces chemical tempering in a soda-lime glass.

From a molecular perspective, briefly explain the mechanism by which clay minerals become hydroplastic when water is added.
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