Ceramics - Science topic

Parameters as standard like porosity for ceramic membrane & what others?

I am using a circular disc type PZT. Since I couldn't find a definitive source, I would like to confirm whether I should place the metal side, which is brass, directly on the surface, or should the ceramic side face the surface instead?

Soda lime silica glass can be used as a flux in ceramics to replace mined materials such as feldspar and quartz. In clay and glazes other waste, for example soap stone sawdust, can also be used to introduce oxides to the mixture. Iron oxide roast, which is leftover from sulphur industry, can, due to its high iron content, be used as a colorant in ceramics. All of the mentioned materials can also be used as a filler in the clay body up to 20-30 % at least. Since ceramics production is highly harmful to the environment, its use of raw materials should follow the principals of circular economy and aim at reducing the use of energy, water and virgin materials.

This is from dielectric spectroscopy data for a metal-oxide ceramic that has two major phases and a small amount of a third phase present. It's a plot of AC conductivity vs angular frequency for this sample at a particular temperature.

I have tried both the single and double power law's. I've tried adding a third and fourth term. How do I interpret this result? What should I use to fit this curve properly?

EDIT: I am attaching images of the curve in question. In one image, the plot was changed to a log-log plot.

We began to study silicate materials (sand, clay, ceramics, glass) using WQF-530a FTIR spectrometer. But databases available for this spectrometer don't allow a proper description of the obtained FTIR curves.

Can anyone propose databases or web-sites intended for silicate materials description (Si-O-Si(Al), NBOs, etc.)? Preferably, open access or free.

Thanks.

I want to do the Vicker's indentation testing of my ceramic samples having loads ranging from 10 kgf to 30 kgf. The loads should have steps like 10 kgf, 12 kgf, 13 kgf, 14 kgf, 15 kgf and so on in between. Is there anywhere in India where is it possible to do? Please let me know.

I am not able to get good literature and the physics behind how first these grains and grain boundaries arises out of no where when we make a pellet to study its dielectric properties and then how are they so important when studying its electrical properties.

Will love to hear its physics or provide me with good book which discuss these things and concept regarding the concept behind them!!

Has any one ever successfully using ball mill to reduce ceramic flake from 100s microns down to 10s-20s microns without turning them into ultra-fine powder? I've put this question in Google and what it turns up are generic ball mill stuffs. Any good references will be very appreciated. Thank you!

P.S. although I can't share the composition of our flake due to the nature of my project, what I can share is that the flakes are non-reactive in neutral aqueous environment and ambient temperature/environment. The flakes are not super hard like tungsten or alumina, but have fair amount of hardness. We plan to use a high-energy, planetary ball mill.

Does it exist some special technique for cutting ceramic membranes for Cross-sectional FESEM or SEM images?

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as of my knowledge z90 is acrylic based sealant adhesive.

Dear Prof, is there a subtle distinction between the terms "substitution" and "doping" when referring to modifying ceramic dielectric materials for example Na0.5Bi0.5TiO3? Is there any difference in how these terms are used within the fields of science vs engineering? thank you very much

Ceramics around the road are dated from 1050 to 1130 CE according to research by Hayward Franklin and Pierre Morenon, which may help date the road, but I was wondering if there was any other source. I am updating a generational history of the Pueblo people called A Rosetta Key for Ancestral Pueblo History. Thanks.

How they are different from each other in terms of alignment of domains? Poling is a critical process used in various materials to enhance their piezoelectric, ferroelectric, or nonlinear optical properties by aligning their internal dipole moments. There are several types of poling mechanisms, each utilizing different methods to achieve domain alignment. Understanding the differences between these mechanisms is essential for selecting the appropriate technique for specific materials and applications.

How AC poling, DC poling, thermal poling, optical poling, corona poling, and plasma poling differ from each other, particularly in terms of how they align the domains within the material?

In solid ceramic electrolyte what is the Physical significant of area under the curve in dielectric loss tangent studies ??

We want to measure real-time complex dielectric properties of LTCC ceramic pellets at temperatures above 500 degree Celsius. Is it possible to measure the complex dielectric permittivitty of ceramic pellets at elevated temperature above 500 degree Celsius using an LCR meter?

What is the typical viscosity range for ceramic pastes used for the Direct Ink Writing (extrusion) process? I have read several articles, and all give different figures; I saw somewhere else that between 20 Pa.s and 50 Pa.s is ideal. What is your answer to this?

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which silisium compounds are used as car ceramic coating? which Monomer or polymer and additives that are used for car ceramic coating?

For treatment of water (river), what is the life of ceramic membrane? For example, 5 years or 50 years? MF or UF?

Operation of ceramic membrane after usage: should be kept under water like polymeric membranes?

Throughout my academic journey, I have never had the opportunity to meet Ceramics industry players in any colloquium organised by my department. I am sure that I may not be alone to miss this opportunity as a student. Kindly share your views with me on how industry player-led colloquiums could enrich educational experience in higher institutions

In context of use of pva as a bibder in calcined powder.

I've prepared the following ceramics:

What are the optimal techniques for achieving this?

Can you please tell me the theory of semiconductor ceramics: introduction, properties, manufacturing methods and applications ?

Hello!

I want to anneal magnesium at high temperature in a vacuum oven? What material should my glass be made of? Quartz, ceramics, stainless steel? So that they do not react with magnesium? I heard that magnesium reacts with quartz at high temperatures? What should I use?

Ceramics used in ballistic impact

Do anyone have idea regarding how to process a textured ceramics.

How is it different from normal ceramic synthesis?

For example we can find the main phases using XRD, but I wanna know how to find the dopants, sintering aids, etc.

Dear Prof and Dr, is that the pioneer of NBT ceramic is G.A Smolenskii ? I cant find the information. Thank you very much

Many studies and industries are known to filter coal- syngas by means of assemblies of candle filters. Is it possible to/ Do any systems exist to instead use huge ceramic monolithic devices (similar to DPF) for removal of particulate matter from syngas?

I have measured the sound absorption coefficient in each sample I made using a ceramic mixture. The perforation was done with the same dimensional holes and perforation increased as A-E as follows. I was confused with my reading since it was not as I expected. Is there any physics theory other than sound energy dissipation by walls of holes?

Hi,

I took some FTIR (ATR) readings of a polymer composite (epoxy+ fumed silica+ ceramic filler) we are working on. The peaks seem to decrease in intensity with increase in ceramic and filler content. I am new to FTIR but based on what I have read decrease in peak intensity corresponds to reduction of bonds which absorb that wavelength if so doesn't that mean these fillers are impeding growth of the polymer chain bonds? But I had a doubt that wouldn't these opaque particles being in higher concentration block the IR and reduce transmittance and then the decrease in peaks just means the IR was not able to penetrate the sample due to presence of these particles and not actual decrease in polymer chain formation. Can someone explain this to me.The attached graph is transmitance % vs wavelength Thank you.

Dear Researchers,

We are seeking to conduct a dilatometry test on a cylindrical green pellet of doped ceria ceramics featuring dimensions of Diameter = 8 mm and Height = 20 mm, encompassing a temperature range from room temperature to 1400 °C with a heating rate of 5 °C /10 °C per min. We are reaching out to inquire about the feasibility of performing this specific test within research laboratories in India.

Could you kindly assist us by providing information regarding the availability of facilities capable of accommodating this dilatometry test on our specified specimen dimensions and temperature requirements? Any guidance or recommendations toward laboratories equipped for such testing would be greatly appreciated.

Your expertise and assistance in identifying potential research facilities or laboratories in India capable of conducting the dilatometry test within these parameters would be immensely helpful.

Thank you for your attention to this inquiry. We look forward to any insights or recommendations you may provide.

Thanking you,

A K Lakshya

I am currently processing an experiment using NaBH4 to etch the surface of my material.

I am finding a substrate material which is (1) not reactive to NaBH4 (or basic liquids), (2) stable in high temperatures (upto 1100 °C), and (3) not electronically conductive. It would be better if it is also affordable.

I used to use Al2O3 (sapphire substrate) but recently I figured out that it can react with NaBH4. Every feature without this reactivity should be similar to Al2O3.

Please suggest some.

What performance losses will silicon dioxide cause to ceramics when used as a sintering aid for ceramic ?

I would like to know the effect of different sintering aids on the properties of alumina ceramics.

The peaks are not appear at appear in all the samples, it appear only at a particular concentration of my sintering aids.

If we want to laser metal or ceramic powder on a coating substrate, without having a powder injection source, how should we do this? That is, how to stick the powder on the substrate and then pass the laser over it?

We are trying to measure degree of conversion of resin composite under ceramic restoration using FTIR. The specimens are flat and are cured next to a cellophane strip, so they are smooth and relatively flat. However, since we are just interested in the aliphatic and aromatic peaks at 1638 and 1608 in the spectral data, even after being flat and in close contact with the ATR crystal, we do not get any signal.

Would you think of anything we might be doing wrong?

We tried crushing the resin composite specimens and using the powder, we still had no luck.

Any idea that might help us I look forward to your reply.

Thank you.

The crystallite size measured using Debye Scherrer method shows 50nm in polycrystalline ferroelectric ceramics. Is it possible to increase the crystallite size to micrometer range. If so, what will be the possible method?

I am using 4000 cP methyl cellulose for aqueous tape casting. Since it gives very viscous solution, I am dissolving it in 1.5 wt% in 98.5 wt% DI water. Still it is a very viscous solution. Because of a large quantity of inherent water coming from the MC binder solution, I cannot use more than 1 wt% binder active matter w.r.t powder in slurry, otherwise the powder settles down on container base and water floats on top and there is no mixing because of a lot of water.

What MC viscosity is better keeping in mind a higher possible weight percent dissolution in water? And in how much weightage should it be dissolved in water and at what temperature?

Since sedimentation of particles is very high, what do you recommend for usage of such sized particles for making a good slurry?

I would like to do the Rietveld refinement analysis from Topas software for ceramic Sodium Bismuth Titanate. But I didn't get the procedure step. Thank you very much.

SEM micrograph of doped Barium Titanate ceramics had certain white spots on the grains? What can be the possible reason for such white spots?

Some polymers having low dielectric constant used with high dielectric ceramics. But why we are merging these two high and low dielectric materials?

In my undergraduate research, i am planning to investigate effective pore size and the effect of sound absorption in directional pores in ceramic material. So I am planning to obtain a porous ceramic sample with a diameter of 5 cm with 1 cm thickness. what should be stating pore size if they are in cylindrical type

While in piezoelectric ceramics, a liquid phase can be observed easily with a conventional solid method preparation, however there seems to be no research to figure out whether the liquid phase can affect the mechanical quality factor (Qm) of ceramics.

Hello everyone¡

We are working with different Yttria-Stabilized-Zirconia (YSZ) ceramics, having different Yttria contents (5 % wt. and 8 % wt.).

Is there any correlation between electrical conductivity and Yttria Content?

Thanks a lot¡

For dating purposes, to calculate the annual radiation dose in ancient ceramics, the contribution of natural radiation from radionuclides which includes 40K, 238U, and 232Th of the environment (sediment) and inside the ceramic material should be considered. How to calculate the annual radiation dose in ceramics, when there are significant contribution of U, Th, K from both ceramics and sediments. Even the contribution of ceramics is greater.

Dear All

I study ethanol electrooxidation on Pd, which is supported on carbon using cyclic voltammetry.I prepare the working electrode by adding 5mg of powder to 33µL Nation and 467µL of ethanol followed by 20 min sonication.Then I add 20µL (200µg powder) of the ink into the glassy carbon electrode surface.Problem is some of the ink get dried on the ceramic outside surface of glassy carbon.I can not control or accuartely define how much of the slurry has dried on the glassy carbon and how much was dried on the ceramic surface.That is why I am obtaining non-reproducible CV results every electrode experiment I run.I use the same electrolyte concentration, scan rate, reference electrode, and same area of working electrode. The only different thing is the working electrode, which is from the same material ink. Theoretically, it should give identical or very similar CV results.

Hello all, I'm working on a project about 3D printing ceramics. I'm trying to reproduce the high solid loading alumina slurry (>= 60vol%) used in a paper but cannot get it work. The recipe I used is from the following:

The paste was composed of alumina powder, deionized water, ammonium polymethacrylate (DARVAN® C-N, Vanderbilt Minerals, Norwalk, CT, USA), and methylcellulose (Methocel J5MS, Dow Chemical Company, Midland, MI, USA). For parts which were intended to be freeze dried (as will be discussed in section 2.6.1), 20 wt% glycerol was used as suggested by Sofie and Dogan [35] to prevent the growth of large ice crystals and freezing defects associated with water crystallization. The alumina powder was dispersed in water using 0.94 g Darvan C per 100 g of powder, and then ball-milled for ~15 hours to break up agglomerates and to produce a uniform mixture. (Ghazanfari et al, 2017. DOI: 10.1016/j.addma.2017.04.001)

I'm using the same alumina powder (A16SG) and ammonium polymethacrylate (Darvan C-N) as from the paper. Calculated from the recipe, the composition of my slurry is 71.10g of alumina, 0.63g of Darvan C-N, and 11.44g of DI water for a 30mL slurry. Ball-milled 18+ hours with 20 zirconia balls at approximately 60 RPM in a plastic jar with 3" diameter. The slurry comes out from the ballmill is not a uniform mixture, with some amount of solid chunck and highly viscous. Attached is a photo of the "slurry" after ball-milling.

Anyone have an idea what would be the potential issue? And what is the highest solid loading ever achieved for alumina in research? Thanks.

"I'm searching for innovative and advanced methods for bonding ceramics to ceramics and metals at high temperatures, suitable for a range of industrial uses. In recent years, ceramics like silicon carbide have become popular for high-temperature joint formation due to their strength and resistance to temperature, chemicals, and wear. However, current techniques have drawbacks such as joint failure and the need for specialized equipment and conditions. I'm interested in new technologies that can overcome these limitations."

I've polished my pellet using diamond paste after using SiC paper of grit size 2000. But I haven't obtained optical image with clear grain boundaries. What should I do after polishing to get a more clear and well established grain boundaries?

I am looking for simple way to calculate the thermal conductivity K of my samples (ceramic), in my uni using old equipment "Cusson" but with unacceptable results, so I need other way/ modern device name to do that, with thank you in advance to all..

Recently, after each coating, the plating cavity appears blue purple, we use Agron and N2 to cover the yellow color.

So in a simple way, the path to create a tile/ceramic (with conventional ceramic processing / solid state reactions) is as follows:

1-Mixing powder

2-Calcining

3-Pressing

4-Sintering

In my case (manganese zinc ferrite) the temperature for both Calcining and Sintering process are relatively the same. I wanted to know if it is possible to exempt the process from Calcining step, and only rely on Sintering process to both (1) Synthesis the crystalline structure, and (2) From the ceramic?

what are the ways by which we can prevent crack generation due to CTE mismatch at high temperature sintering.

I'm cofiring silver and PZT...

#Silver #PZT #Ceramic #CTE mismatch

I want the correct method to infiltrate the carbonate mixture into a ceramic hollow fibre membrane. Based on some of the publications stated that the carbonate mixture needs to be pre-heated at 600oC before the addition of membrane in a vertical furnace. Do I need to pre-heated the carbonate mixture, or can I just put the membrane in the carbonate mixture and heat at 600oC?

I also need to know how to put the mixture in a vertical furnace. How can a vertical furnace hold the sample?

I appreciate any help you can provide.

I've also tried 5wt% PVA binder in second ball milling after calcination of a solid state route dielectric ceramics.

But the binder is like a gelly after ball milling shown in picture, and still there is cracks in green pellets

(with & without binder) after pressing at 6 ton/cm to minimum possible pressure.

Whats the possible reason of layers and diagonal cracks in green pellets?

Could any one of the respected researchers help me in this troublesome?

I'll be very thankful to give your valuable suggestions!

Hello to all, These days I am focusing on the issue of electrophoretic deposition of different ceramic and metal particles for various coating applications. I have read a lot about the important parameters effective in this technique to reach a good and homogeneous deposit, but yet a basic question is challenging my mind and that is "how can we find the optimum concentration of a specific powder for EPD?" And "What if we have two different powders to deposit simultaneously?" Do you have any idea or experience in this field? I will be glad to hear.

(Na1-xKx)0.5Bi0.5TiO3 (NKBT)(0 ≤ x ≤ 0.30) is a ferroelectric ceramic.

Ionic radii of Na+ is 1.39 A and K+ is 1.64 A.

Please provide detail solution with proper justification.

We are coating 24k Gold on ceramics with TiN, the gold color is not beautiful with deep color, Gas ratio is 200sccm(Ar)/500sccm(N2)-(3min)/(5min).Is this ratio necessary. to tweak???Thank!!

Which area do I divide the force by to get the pressure value in hot pressing?

Hello .

i need to articles or resources about ''Parameter affecting in extrusion 3D printing process of ceramics scaffolds

The question is related to ceramics engineering.

Apart from going to nano size range, is there any other way to increase sintering range of ceramic particles?

I want to perform TG-DTA on NaOH in an inert medium. Generally, alumina and platinum crucible are used for TG-DTA. However, I am confused with respect to crucible material compatibility with NaOH with temperature as high as 600 degree C ?

PUND stands for Positive Up Negative Down signal commonly used for subtracting the circuit leakage from the actual response. I am using an Arduino.

Hello, I am a student working on a nasa project where i am commercializing a nasa patent. My patent is a specific type of ceramic coating I want to apply in the medical field. I am currently trying to price out competitors but they do not want to give me much information. I was wondering if anyone on here knows what some of these companies might charge to coat smaller tools, like operating room tools. Companies like a1 medical, precision coating, calico coatings, and surgical coatings.

I hope this is appropriate to ask here. Thank you in advance.

Does the Calcination temperature required for preparation of ceramic sample change with whether ( India- summer temp 30-40deg, winter temp-5-10deg)?

I want to make a biocomposite using chitosan and hydroxyapatite. How can I proceed to make samples to characterize mechanical properties?