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Chapter 19: Problem 29

What measures may be taken to reduce the likelihood of thermal shock of a ceramic piece?

Short Answer

Expert verified
Answer: To reduce the likelihood of thermal shock in ceramic pieces, some measures include controlling heating/cooling rates, using materials with low thermal expansion coefficients, designing the piece for even heat distribution, pre-stressing the material, and using proper insulation for temperature control.

Step by step solution

01

Understand thermal shock

Thermal shock is a phenomenon that occurs when a material, like a ceramic piece, is exposed to a rapid change in temperature. Due to the uneven expansion and contraction, stress will be induced in the material, which may cause cracks, deformation, or other damages.
02

Measure 1: Control heating/cooling rates

One way to reduce the likelihood of thermal shock is to control the rate of heating and cooling. Gradually increasing or decreasing the temperature allows the ceramic piece to expand or contract uniformly, reducing the stress induced within the material. Avoid sudden exposure to high or low temperatures to minimize stress.
03

Measure 2: Use materials with low thermal expansion coefficient

Another measure to reduce the likelihood of thermal shock is to use ceramic materials with low thermal expansion coefficients. A low thermal expansion coefficient means that the material will undergo less deformation when subjected to temperature changes, ensuring that the stress induced is minimized.
04

Measure 3: Design for even heat distribution

The design of the ceramic piece can also play a significant role in reducing thermal shock. Ensure the piece has a uniform thickness and shape, eliminating any stress concentration points. This design will enable even heat distribution and prevent any localized areas of high stress.
05

Measure 4: Pre-stress the material

Pre-stressing the ceramic material can help to reduce the risk of thermal shock by inducing an opposing stress to counteract the stresses caused by thermal expansion or contraction. This can be achieved by applying a compressive stress on the ceramic piece during manufacturing, which can help to resist the tensile stress caused due to the temperature difference.
06

Measure 5: Proper insulation

Using proper insulation materials around the ceramic piece can help in reducing the rate of heat transfer, leading to more uniform and controlled temperature changes. This insulation will minimize the temperature gradient across the piece, thus reducing the likelihood of thermal shock. In conclusion, to reduce the likelihood of thermal shock in ceramic pieces, we can control the heating/cooling rates, use materials with low thermal expansion coefficients, focus on designing the piece with even heat distribution, pre-stress the material, and use proper insulation for temperature control.

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Most popular questions from this chapter

For each of the following pairs of materials, decide which has the larger thermal conductivity. Justify your choices. (a) Pure copper; aluminum bronze (95 wt \% Cu-5 wt \(\% \mathrm{Al})\) (b) Fused silica; quartz (c) Linear polyethylene; branched polyethylene (d) Random poly(styrene-butadiene) copolymer; alternating poly(styrene- butadiene) copolymer

(a) Briefly explain why porosity decreases the thermal conductivity of ceramic and polymeric materials, rendering them more thermally insulative. (b) Briefly explain how the degree of crystallinity affects the thermal conductivity of polymeric materials and why.

For some ceramic materials, why does the thermal conductivity first decrease and then increase with rising temperature?

Compute the density for nickel at \(500^{\circ} \mathrm{C}\), given that its room-temperature density is \(8.902 \mathrm{~g} / \mathrm{cm}^{3}\). Assume that the volume coefficient of thermal expansion, \(\alpha_{v}\), is equal to \(3 \alpha_{r}\).

Briefly explain thermal expansion using the potential-energy-versus- interatomic-spacing curve.
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