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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

Expert verified
Answer: Drying shrinkage increases with smaller clay particles in slip cast or hydroplastic products because the smaller particles have a higher surface area-to-volume ratio, resulting in stronger capillary forces during the drying process. These stronger capillary forces pull the particles closer together as the water evaporates, causing greater shrinkage.

Step by step solution

01

Understanding Drying Shrinkage

Drying shrinkage is the reduction in volume and size that occurs when a slip cast or hydroplastic product dries. It happens because the water in the clay evaporates, causing the clay particles to come closer together. This results in a decrease in the overall size of the product.
02

Role of Clay Particle Size

Clay particles in slip cast or hydroplastic products have a large surface area relative to their volume, which means that there is more contact area between individual particles and the surrounding water. As the water evaporates, capillary forces pull the particles closer together, leading to shrinkage.
03

Effect of Smaller Clay Particles on Drying Shrinkage

Slip cast or hydroplastic products with smaller clay particles have a greater surface area-to-volume ratio, due to the higher number of particles per unit volume. This results in a larger amount of water being in contact with the clay particles, leading to stronger capillary forces during the drying process. Consequently, the drying shrinkage is greater for these products with smaller clay particles.
04

Concluding Reason

One reason why drying shrinkage is greater for slip cast or hydroplastic products that have smaller clay particles is because the smaller clay particles result in a higher surface area-to-volume ratio. This allows for stronger capillary forces during the drying process, which leads to greater shrinkage as the water evaporates.

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Most popular questions from this chapter

(a) What is crystallization? (b) Cite two properties that may be improved by crystallization.

Cite the two desirable characteristics of clay minerals relative to fabrication processes.

Compare the manner in which the aggregate particles become bonded together in claybased mixtures during firing and in cements during setting,

(a) Explain why residual thermal stresses are introduced into a glass piece when it is cooled. (b) Are thermal stresses introduced upon heating? Why or why not?

(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.
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