Comparing Ceramics... (1 Viewer)

[CHUDYMASTER]

What properties should I look for when comparing 2 ceramics when heated.

What would be the resultant outcomes of heating these ceramics with reference to these properties?

Any ideas?

 

[Lazarus]

Whether they conduct or not (at high temperatures) would probably be a good one.

Think about what ceramics are generally used for and what properties might be important in that sort of application.

 

[CHUDYMASTER]

Well safe shuttle re-entry...

so heat capacity and...?

 

[Lazarus]

Oh re-entry mm I hadn't thought of that - I was thinking more about how ceramics are used as insulators.

Heat capacity... ablation... sort of interrelated.

What exactly is your question? =P

 

[CHUDYMASTER]

Well basically, right? I got this assignment, right?

Now it involves me comparing the behaviour of two properties of 2 different ceramics when heated.

My problem is that I'm not sure which 2 properties to examine in this experiment.

 

[McLake]

Originally posted by CHUDYMASTER
Well basically, right? I got this assignment, right?

Now it involves me comparing the behaviour of two properties of 2 different ceramics when heated.

My problem is that I'm not sure which 2 properties to examine in this experiment.

Maybe "brittleness" and "heat reflection"?

 

[CHUDYMASTER]

heat reflection? brittleness? How would i quantify such things experimentally?

 

[McLake]

Originally posted by CHUDYMASTER
heat reflection? brittleness? How would i quantify such things experimentally?

I have no idea. What kind of assignment is that anyway, we covered that as a prac in class ...

 

[CHUDYMASTER]

Physics (obviously).

What was involved in the prac?>

 

[McLake]

Originally posted by CHUDYMASTER
What was involved in the prac?

We used an electric sander to heat up the material, recording temprature with a special probe (conected to a computer). Not very practicle for home use.

I suppose brittlness could be tested by droping things from various heights?

 

[CHUDYMASTER]

But what could I look for to make it experimentally correct?

And with that prac, did you use a datalogger or something?

 

[McLake]

But what could I look for to make it experimentally correct?

???

And with that prac, did you use a datalogger or something?

Yes

 

[CHUDYMASTER]

I mean I can't examine brittleness qualitatively, that's crap!

So how do I say which is more brittle than the other?

 

[McLake]

Originally posted by CHUDYMASTER
I mean I can't examine brittleness qualitatively, that's crap!

So how do I say which is more brittle than the other?

I don't know ...

 

[CHUDYMASTER]

Very helpful.

Do you think spectroscopy has any relevence? Like perhaps the colour changes in the heated materials?

 

[McLake]

Very helpful.

Sorry.

Do you think spectroscopy has any relevence? Like perhaps the colour changes in the heated materials?

Can you detect that?

 

[BlackJack]

If you want to go for the extremes, go to the material sciences section of a uni and ask around. There are machines that apply a force to an item, and increase it constantly... I've seen one before.

There is a quantitative measure for brittleness, but it's kinda more advanced.

Lake, different ceramics are probably going to smash at very similar heights... you'll need lots of the same ceramics, and you'll have to improvise to determine the height dropped... (tape measure, step ladder, and method of marking heights...)
For that, you'll have to drop it in the exact same orientation, (hard if you try to keep ceramic parallel to the ground...)

 

[McLake]

Originally posted by BlackJack
If you want to go for the extremes, go to the material sciences section of a uni and ask around. There are machines that apply a force to an item, and increase it constantly... I've seen one before.

There is a quantitative measure for brittleness, but it's kinda more advanced.

Lake, different ceramics are probably going to smash at very similar heights... you'll need lots of the same ceramics, and you'll have to improvise to determine the height dropped... (tape measure, step ladder, and method of marking heights...)
For that, you'll have to drop it in the exact same orientation, (hard if you try to keep ceramic parallel to the ground...)

Yes, I didn't think of that ...

 

[CHUDYMASTER]

To conclude:

I am looking for what properties exactly?

I am going to find equipment at a university.

I am somewhat screwed, as the due date is nearing.

 

[BlackJack]

Spectroscopy? Requires a higher temperature, chudy... and do you have equipment for that?

edit: cancel post

I don't know much about ceramics they'd use on a space shuttle... mp/bp obviously don't work...

*brainstorms*
okay, what about ablative effectiveness?
Keep a pair of electric sanders w/ special snad paper (harder than ceramic in question) for half an hour. Wash and measure heat and decrease in volume?

No, that wouldn't really work...