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Chapter 13: Problem 21

(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?

Short Answer

Expert verified
Answer: The three main components of a whiteware ceramic, such as porcelain, are clay, feldspar, and quartz. Clay acts as a binder, providing plasticity and reducing shrinkage during the forming process. Feldspar serves as a fluxing agent, binding the clay and quartz particles together during firing to enhance strength and translucence. Quartz provides structural support, minimizes warping, and contributes to a more rigid final product.

Step by step solution

01

Main components of a whiteware ceramic

The three main components of a whiteware ceramic, such as porcelain, are: (1) clay, (2) feldspar, and (3) quartz. #b)
02

Role of clay

Clay acts as a binder in the forming process. It provides the necessary plasticity to develop the shape of the ceramic during the forming process. The water content in clay helps the ceramic to take the desired shape, and its presence also allows the ceramic to dry with reduced shrinkage and warping.
03

Role of feldspar

Feldspar is the fluxing agent. It melts at a certain temperature during the firing process and binds the quartz particles together, as well as with the clay particles. This binding results in the formation of a glassy matrix which enhances the strength, durability, and translucence of the ceramic.
04

Role of quartz

Quartz acts as a filler and provides the structural framework for the ceramic. During the firing process, its low thermal expansion characteristics help to minimize warping and cracking, making the final product more resistant to thermal shock. Additionally, quartz partially dissolves in the glassy matrix formed by feldspar, resulting in a more rigid structure.

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Most popular questions from this chapter

For refractory ceramic materials, cite three characteristics that improve with and two characteristics that are adversely affected by increasing porosity.

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 \(\mathrm{Na}^{+}\), will induce chemical tempering in a soda-lime glass.

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

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

(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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