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Engineering Stack Exchange

Questions tagged [ceramics]

20 questions
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Can Rotary Friction Welding be used to join metals and ceramics?

Is Rotary Friction Welding a good method to join cylinders of a metal (such as Ti alloy) and a ceramic (such as SiC). I know that Diffusion bonding can be used in such cases. However, it has its own disadvantages - particularly its time-consuming…
user0
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What material should I use to store molten metal?

I'm performing an experiment based on slag corrosion behavior of the refractory material. I need to store molten metal at $\approx$ 1600-1700 K for that. Specifically, I'm working on slag corrosion and penetration behaviour of refractory…
dilkesh kumar
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What is the highest-temp castable refractory cement available?

I very much ruined 3 $10 diamond hole saws making this ceramic insulator out of a firebrick and Ryobi drill press. Drilling out the large core took 1-2 hours and a lot of arm strength. Therefore, I will turn to custom ceramic shops or my own…
Daniel Donnelly
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What's the most cost-effective cutter bit material that can be used to machine aluminum oxide?

Al2O3 is a hard, white material used for making firebricks and numerous molded ceramic parts. Say I had a firebrick, took a core out of it using a thick-walled diamond hole saw and a drill press. What lathe insert material would I then use to…
Daniel Donnelly
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Why Green Porcelain was Used for Chalkboards

This site: https://www.businessinsider.com/why-most-blackboards-are-actually-green-and-not-black-2017-11#:~:text=The%20color%20change%20came%20in,likely%20to%20survive%20the%20journey states that chalkboards are often green because manufacturers…
MeltedStatementRecognizing
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why did my ceramic matrix composite turn out brittle as snow?

I have attempted making a ceramic matrix composite (cmc) by wetting glass fiber cloth with waterglass and baking it at 200°C. The resulting material disintegrated on touch. Unwetted fibers did not change their properties after baking. How can this…
Francis L.
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Kiln design, heating element holders

I intend to build a kiln in my free time over the next few months and am trying to avoid my past mistakes (heated too quickly, the kiln started cracking, the kanthal element melted and it was just plain terrible). So I'm thinking of using element…
Semptum Valoris
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Ceramic pressure measurement - piezoelectrical or capacitive?

Context: I'm writing about an old industrial training facility used for a petrochemical process. In this training facility, there is a 3-phase separator. On that separator is a pressure measurement. My teacher, having limited knowledge of the…
A. Kvåle
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Exact definition of ceramics

Exactly what are "ceramics"? I found a lot of similar "definitions" of that term online, e.g. on Wikipedia and here. These (and other) sources essentially state that ceramics are non-metallic, non-organic materials. And they state the most…
Elon Musk
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Connect heated copper tube in PVC tube

I have a copper tube that I'm heating (quite a lot) with a torch, I have to connect a PVC pipe in the entrance of the copper and one in the exit (so water can flow through the copper pipe). The only problem is that the copper tube is too hot, so…
Lucas Heise
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Is it possible to create a hard slick non-stick non-degradable substance?

I once read on a web page I can no longer find that corundum is a covalent network. I'm guessing that's because despite the fact that the electronegativity difference between aluminum and oxygen is more than 1.7, corundum has exactly 2 valence…
Timothy
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Power from piezo material

Suppose there is a given piezoelectric material and under a given force it produces voltage $V$. If an external electric circuit is attached with load $R$, the current will be $I= V/R$. Also power generated will be $V^2/R$. By choosing $R$ very low,…
bfugvbjimk
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Identification of cylindrical part with unknown purpose

I came across some of these parts and have no idea what they are. It could be related to bearings, but most likely not. I also have other, similar looking parts but of all different dimensions (with the same shape). Material feels quite hard, almost…
user2660278
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Is it possible to build a radar that is shielded behind one meter of ceramic material and still detect people 500 meters away?

I saw that there are radars which can detect people behind walls, so I wonder what the limitations of radars are when it comes to detecting people while being protected behind thick ceramic shield.
eleanor
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In this “hybrid” ceramic 608 bearing is there likely a plastic piece holding the bearings?

I have some “hybrid” bearings that I purchased a long time ago on Amazon. They have silicon carbide balls and steel inner and outer races, as you can see in the photos. What I am wondering is what are the other pieces that seem to be holding the…
user391339
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