Questions tagged [ceramics]
Use this tag for ceramics materials and their properties.
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Type of British porcelain invented around 1917-1918
Being subscribed already for 30 years on Scientific American, I recently downloaded the whole archive, and I am now going through 1914-1918.
In the 26 January 1918 issue, on page 95, there is a small ...
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Could the presence of multiple stabilizer oxides induce sluggish diffusion in a stabilized zirconia to increase lifetime?
The presence of yttria stabilizes zirconia's high temperature allotropes, but it also decreases the lifetime due to more defects that can induce more diffusion into yttria rich and poor regions, ...
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Would fluorides stabilize zirconia?
The reason for zirconia's cubic and tetragonal phases not being stable is that the cation-anion ratio is too small for proper contact between ions.
One way is to use other oxides that have a bigger ...
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How to chemically remove niobium from boron carbide?
Previously I asked about chemical removal of CaO from boron carbide. I keep considering some refractory materials for use as sacrificial ones, so now I wonder if and how a layer of niobium (about 1.5 ...
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How to chemically remove CaO from boron carbide?
Previously I asked (How to remove graphite substrate of boron carbide coating?) how to chemically remove a thick layer of graphite from a thin layer of boron carbide. It turned out that was a hard ...
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Can a colorant be mixed into zirconia powder?
I’m wanting to color zirconium dioxide into beads after it is fired but I would like to get more colors than just white and the high temperature black oxide. Can I mix other metal oxides to zirconium ...
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What's the formal definition of a ceramic in chemistry?
Dictionary.com defines a ceramic as:
noun (used with a singular verb) the art or technology of making
objects of clay and similar materials treated by firing. (used with a
plural verb) articles of ...
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why does the single crystal ferroelectric have a different hysteresis curve compared to polycrystalline ferroelectric?
For the ferroelectric hysteresis curve, is there a reason why single crystal ferroelectrics have a 'hard' ferroelectric hysteresis curve compared to 'soft' ferroelectric hysteresis curve for ...
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How to remove graphite substrate of boron carbide coating?
I have a boron carbide coating (the thickness is either 90 microns or 220 microns) on a graphite substrate (the thickness is 0.5 inch - about 13 mm, the other dimensions are 2x2 inch$^2$ - about 5x5 ...
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The use of far-infrared ceramics for water purification?
I am struggling to understand how exactly far infrared ceramic balls help purify the water. It is stated that active ceramic taormine balls help purify the water by forming a 2 micrometer wavelength ...
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Navigating through the various characterisation technique?
We synthesis a lot of ceramic catalysts. For a long time now, we are facing problems in accurately and efficiently characterising the synthesized powders. We have identified the main problems as ...
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Searching for low cost alternative for zirconia ceramic crown
I have seen one company call as you have seen below:
Call for "Development of Zircon Alternative Formulations in Ceramic Tile Glazing Industry"
So I have searched for finding the low-cost ...
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Why does calcined feldspar crumble?
For context, I am a potter and am interested in collecting and processing all materials that I use by myself. One of the processes which I use is calcination of certain minerals like feldspar, so that ...
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What is calcined lawsonite?
For context, I am planning to try and use this sample to make a ceramic glaze.
I recently collected a sample of what I think is lawsonite, which has the chemical formula $\ce{CaAl_2Si_2O7(OH)_2*H_2O}$....
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What (non toxic) light sensitive materials do not burn away at high heat?
Specifically related to photoceramics, I am wondering what photosensitive materials exist that can be bonded to glass at high heat in a kiln (a microwave kiln to be more exact).
By non-toxic I mean a ...
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Why is ruthenium dioxide a conductor while titanium dioxide is an insulator?
Ruthenium dioxide has the same crystal structure as rutile (titanium dioxide), and the metal atoms are in the same oxidation state. Yet ruthenium dioxide is a metal-like conductor (its resistivity is ...
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Removing wood stain from a ceramic surface
I have a bathtub that I accidentally poured wood stain into. Now the stain is all over the white ceramic surface of the tub. I tried using bleach but it didn't do anything. I'm curious if there is a ...
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What is meant by "basis" in "... its basis in particles leads to a material comprising crystallites or grains tightly bound together, ..."?
I am currently studying Ultrasonic transducers – Materials and design for sensors, actuators and medical applications by Kentaro Nakamura. In chapter 1.2.1 Ferroelectricity, the author says the ...
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How does flocculation in paint work?
I recently learned that you can clean up latex paint wash-up water by flocculating it: adding aluminum sulfate and hydrated lime. I vaguely remember how flocculation works in clay slurries (change in ...
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About alternative magnetic effect on porcelain (for induction furnace purposes)
I am trying to use the Induction furnace mechanism (like described via this video), for heating part of the Muffle furnace, as one dental porcelain furnace prototype.
So, my plan is to put copper coil ...
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Can ZrO2 be made fluoride resistant?
$\ce{ZrO2}$ has great properties, biocompatibility, chemical resistance, decent scratch resistance, great thermal resistance and refraction, but it could be better. It, like glass, will slowly react ...
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What reaction could rubidium undergo in a vacuumed chamber with Macor ceramic and glass?
In the center of the chamber on the photo below you can see the hexagonally-shaped Macor glass-ceramic consisting of
Silicon dioxide $\ce{SiO2}~46\%$
Magnesium oxide $\ce{MgO}~17\%$
Aluminum oxide $\...
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Synthetic ruby - damaged by heat less than its melting point?
A bit of a jewellery question but chemistry related. I want to encase a synthetic ruby (corundum, Al2O3) in silver by melting the silver around it. Either in a furnace or by casting. The MP of silver ...
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What is the crystal structure of bismuth oxyhydroxyphosphate (BOHP)?
The recent Chemical & Engineering News article Photocatalyst shreds drinking water contaminant PFOA report the following:
Cates and his colleagues made an accidental breakthrough while testing ...
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Is it possible to make Prince Rupert’s drops with molten alumina?
When molten glass is dropped into water, you can get tear-shaped objects which are both incredibly strong and which have massive internal stresses. Which means any scratch can cause them to explode.
...
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Reaction that will produce a silica coating (glaze)
The normal way to create a coating of pure silicon dioxide glaze is to coat the object to be glazed in a slurry of silica particles and then put it in a kiln.
However, if I have an object that is too ...
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3D printing of alumina
I want to print a structure of alumina, and the 3D printer that I am using is an extrusion-based printer. So I need your help in knowing that what composition (binders and deflocculant) of alumina ...
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How to get ionic radii for coordination number 12?
I am studying $\ce{ABX3}$ perovskites, and I would like to calculate Goldschmidt tolerance factors for them. The $\ce{A}$ sites in these materials have a coordination number $12$.
The Shannon's ...
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"Non-stick" action on ceramic-coated pans
I understand how PTFE, or Teflon as it is commonly called, prevents anything from sticking to pans; apparently, anything coming into contact with the PTFE coating has ignorably tiny van der Waals ...
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Can a solid be both crystalline and amorphous? [closed]
The first line in the Wikipedia article for "Glass" reads:
Glass is a non-crystalline amorphous solid that is often transparent and has widespread practical, technological, and decorative ...
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Can using isopropyl alcohol on a zirconium oxide ceramic knife harm or dissolve/degrade it? [closed]
Can using isopropyl alcohol to clean a zirconium oxide ceramic knife harm or dissolve/degrade it?
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Why do rare earth metal oxides vary in color so much?
I only know a little about what causes different color, but I know it has to do with the electron orbitals and how they reflect or absorb/emit incoming light. The rare earth metals are in the ...
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Extracting iron oxide from ceramics waste
In my ceramics class, we use iron oxide in our glazes, but a lot of it goes to waste. We have a bucket full of scrap glaze which contains quite a lot of iron oxide, but is also mixed in with silica, ...
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What is the chemical structure of ceramic nonstick coating on pans?
There are lots of pans nowadays that have a ceramic nonstick coating instead of a PTFE coating. However I can not find anything online describing what kind of ceramic such nonstick coatings are. Does ...
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Why does the barium ion in barium titanate move in its tetragonal crystal structure?
Barium titanate is known in the materials science world to be a great dielectric. This is known to be because the $\ce{Ba^2+}$ ion sits off center in the middle of the tetragonal crystal structure.
...
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What does delta letter mean in some ceramics chemical material formula?
Here is a given chemical formula for ceramic material:
La0.6Sr0.4Fe0.8Ni0.2O3-δ
There is a letter δ. What does it stand for? I guess it is something about oxygen vacancies in crystal lattice.
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Is it safe to hold silicon nitride ceramic without protection?
If I have a complete silicon nitride ball bearing unit, is it safe to hold without any protection? If it cracks, or disintegrates is it also safe?
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