glass ceramic high temperature
Posted in ceramic products on 08/30/2011 04:39 pm by admin
glass ceramic high temperature
Viv temps!!! Please help!!!?
I have just upgraded my hog island boa to a 3ft high by just under 2ft high (as he loves to climb whilst he is still young I got him the wooden vivarium) I have a 150watt ceramic heater (with a guard around it) with a 600 watt dimming stat thermostat and I had set the ceramic heater at the top thinking that it would be powerfull enough to reach the bottom but I am wrong and I am in a bit of a pickle because I have even put a heat mat under Neath the hot side and the temperature is at 79 -75
- so I have put him in a Tupperware and placed him in my other snakes cage so that at least he is getting the correct temps- but what do I do ? Is it the glass on the viv ( it is 3mm standard glass)
Do I need to put the heater at the bottom and then the heat will rise nicely heating all the cage? What do. I do? Please help
Thanks allot for answering this 
A picture of this enclosure would help immensely. I just can’t picture what exactly you’re talking about. I also suggest removing your boa OUT of your other snakes cage, that’s a problem just waiting to happen. Get a sterilite tub, solder a few holes and put the UTH and t-stat under the tub temporarily.
Thermal Shock in Industrial Ceramics
There are many reasons for thermal shock failure in industrial applications of ceramics. On analysis they usually come down to one or more of the following factors.
- Material selection
- Material processing
- Design of component
- Application/use of the product
It is often possible to improve the performance by changing one or more of these but as with all ceramic applications thermal shock is only part of the equation and changes must be looked at in context of all the performance requirements.
When designing any product in ceramic it is necessary to look at the overall requirement and often then to find the best compromise that will work.
In high temperature applications, thermal shock is often the main cause of failure. It is comprised of a combination of thermal expansion, thermal conductivity and strength. Rapid changes in temperature both up and down cause temperature differentials within the part, not unlike a crack occurring by putting an ice cube against a hot glass. Movement through differing expansion/contraction leads to cracking and failure.
There are no simple answers to the thermal shock issue however the following guidelines do tend to be beneficial.
- Select a material grade that has some inherent thermal shock characteristics but meets the needs of the application. Silicon carbides and silicates are excellent. Alumina based products are less good but can be improved with the right design.
- Porous products are generally better than impervious and will take larger changes in temperature.
- Thin walled products perform better than thick wall. Also avoid large transitions in thickness throughout the part. Sectional parts may be better as this provides less mass and offers a Pre cracked design alleviating stress raisers.
- •Minimise the use of sharp corners as these provide ideal starting points for cracks.
- Avoid tension loading of the ceramic. Parts can be pre stressed through design to help alleviate this problem.
- Where possible look at the application process to see if it is possible to provide a more gentle change in temperature. Pre heating the ceramic or reducing the rate of temperature change.
The above points will help alleviate thermal shock problems but it is always best to discuss the situation with experts in the field.
About the Author
John Verrier is Managing Director of Anderman Ceramics Ltd, the leading international distributor of technical ceramics with an annual turnover of £5million+. John has over 18 years experience in the growth of ceramic business activities worldwide, ranging from new product development through to strategic planning and implementation of new business ventures.
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