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Chapter 13: Problem 3

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

Short Answer

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Answer: Three characteristics that improve with increasing porosity are thermal insulation, thermal shock resistance, and weight reduction. On the other hand, mechanical strength and resistance to abrasion are adversely affected by increasing porosity.

Step by step solution

01

1. Improved Characteristics with Increasing Porosity

(a) Thermal Insulation: As porosity increases, the amount of entrapped air in the material also increases. Since air is a poor conductor of heat, this results in better thermal insulation properties. (b) Thermal Shock Resistance: A porous material has a higher ability to absorb and dissipate thermal stresses, making it more resistant to sudden temperature changes, reducing the likelihood of cracking. (c) Weight Reduction: The increased porosity means that less material is used for the same volume, reducing the overall weight of the refractory ceramic material, which can be advantageous in certain applications.
02

2. Adversely Affected Characteristics with Increasing Porosity

(a) Mechanical Strength: With an increase in porosity, the mechanical strength of the refractory ceramic material is adversely affected. It becomes weaker due to the presence of a higher number of voids which ultimately affects the material's load-bearing capacity and makes it more prone to cracking. (b) Resistance to Abrasion: The abrasion resistance of the refractory ceramic material decreases with higher porosity levels. Because of the higher number of voids present in the material, it becomes more vulnerable to wear and tear, diminishing its resistance to abrasion.

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Most popular questions from this chapter

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.

(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.

In your own words, briefly describe what happens as a glass piece is thermally tempered.

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

\text { Cite the two desirable characteristics of glasses. }
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