What do most metal surfaces have in common with ceramic materials?
Q. Studying bio materials and I need to know the answer to the above answer. Somehow I don't think the answer is ceramics have metal components, but if that's the answer then I guess I read to deep into the question.
Asked by jamezthurr - Mon Apr 13 12:34:38 2009 - Chemistry - 1 Answers - Comments

A. Most metal surfaces are protected by an oxide film. Essentially these are layers a few atoms thick of ceramics on the surface of the metal. Two good examples of this are Aluminum and Chromium in stainless steel alloys.
Answered by - Tue Apr 14 20:32:17 2009

Why do catalytic convertors contain ceramic materials?
Q. I understand the theory of the catalytic converter however, do these contain ceramic materials because they must operate at very high temperatures? What makes ceramics suitable for use in the converter? Why would other materials fail in replacing the ceramic honeycomb in the converter?
Asked by - Thu Nov 26 09:09:08 2009 - Engineering - 3 Answers - Comments

A. Ceramics are fairly easy to extrude or cast in complicated shapes, will withstand high operating temperatures and tend to be chemically fairly inert, so they don't start reacting with the hot exhaust gases. A point to bear in mind is that the ceramics used are relatively poor conductors of heat. You want the hot exhaust gases to heat up the active surfaces to a high temperature fairly quickly, so that the thing starts working. You would not want a substrate that conducted the heat away before the surfaces could get to operating temperature, or that delayed the temperature build up to a time longer that a typical journey!
Answered by lunchtime_browser - Thu Nov 26 09:45:46 2009

what are the problems with shaping ceramic materials in to products?
Q. what are the problems with shaping ceramic materials in to products? can you explain the significance of hardening in materails?
Asked by ~ - Mon Mar 26 15:31:55 2007 - Engineering - 1 Answers - Comments

A. ceramic materials can get to their shape only my molding/pressing/cooking procedure. you can not forge them, cut them or grind them. The harder the material it can cut (or scratch) softer materials, but on the other hand it is more crispy and can break easily.
Answered by eyal b - Tue Mar 27 04:52:49 2007

why ceramic materials are stronger in compression than in tension?
Q. ??? Not sure i think it might have something to do with the bonds and ceramics being crystalline?
Asked by Controversial Guy :) - Tue Jun 8 00:36:47 2010 - Engineering - 1 Answers - Comments

A. I believe it's because ceramics, like concrete, are a brittle-solid material. Their brittleness makes them susceptible to tensile failure whereas they can withstand significantly higher compressive loads without failure.
Answered by - Tue Jun 8 01:11:26 2010

need help with ceramic materials?
Q. for some ceramics homework i need to know some ceramic materials and if they are strong or not ... need help!!!
Asked by Pappa Smurf - Tue May 6 15:23:46 2008 - Decorating & Remodeling - 1 Answers - Comments

A. Zirconia's probably the strongest ceramic material although more expensive than Alumina which does lend itself well to corrosive environments. Half way between the two is Zirconia toughened Alumina which offers higher fracture resistance to Alumina and costs less than Zirconia. Down the scale of ceramic insulators can be found on the web, but the afoementioned provide the strongest. Good Luck!
Answered by Rainsmart - Wed May 7 12:24:30 2008

When was the technique of 'sintering' first used on ceramic materials?
Q. I have an exam on ceramics tomorrow and was wondering if sintering was used for traditional ceramics (ie. over 50 years ago)?
Asked by - Tue May 26 18:00:47 2009 - Engineering - 2 Answers - Comments

A. Sintering, the solid-state reaction where particles join in a matrix, takes place in porcelain materials to form mullite. So you could say that sintering has been taking place since somewhere between the 7th and 10th centuries. For a purely sintered ceramic, like a High Alumina, I can't tell you the exact date, but my copy of Industrial Furnaces from 1951 describes high alumina brick, and the process for making this. Therefore it is safe to say that "sintering" as a pure process was in use 50 years ago.
Answered by - Wed May 27 17:13:08 2009

Why are metals better conductors of electricity than glass or ceramic materials?
Q.
Asked by - Mon Sep 6 19:56:22 2010 - Physics - 1 Answers - Comments

A. Because metals have a large number of loose electrons, and that is what electricity is, a flow of electrons. .
Answered by billrussell42 - Mon Sep 6 19:59:53 2010

The reasons why ceramic materials are, in general, harder yet more brittle than metals?
Q.
Asked by Rin - Tue Mar 25 00:52:07 2008 - Other - Science - 1 Answers - Comments

A. Made of clay and fired.
Answered by Richard - Tue Mar 25 00:58:22 2008

Engineering materials question (ceramic in specific).. help please!?
Q. consider the following statements about ceramic materials, such as alumina: 1) ceramics have high Young's moduli 2) the strength of a sample of ceramic will decrease with increasing sample volume 3) ceramic materials have high melting points 4) ceramic materials can easily be processed by casting which of the above statements are true? (A) 1, 2, and 3 (B) 2 and 4 (C) 1 and 3 (D)1, 3, and 4 (E) 4 only
Asked by - Mon Dec 26 15:56:31 2011 - Engineering - 1 Answers - Comments

A. (D) 1, 3 1nd 4
Answered by Bramble - Mon Dec 26 22:58:58 2011

why are ceramic materials harder but more brittle than metals?
Q.
Asked by - Sun Apr 25 00:01:45 2010 - Engineering - 2 Answers - Comments

A. The answer lies in the "crystal structure" of the materials. The bonds across grain boundaries in the crystal space lattice of different metals varies, but they can undergo large plastic deformations without rupture. They form strong flexible bonds, whereas nonmetallic crystals form strong but inflexible bonds, making them brittle. In everything there is a "trade off", increase hardness and lose flexibility and toughness, increase toughness and lose some degree of hardness.
Answered by - Sun Apr 25 02:08:04 2010

I would like to know more about ceramic materials in aerospace application?
Q.
Asked by Sangu - Wed Sep 20 05:32:59 2006 - Special Education - 1 Answers - Comments

A. There you go.
Answered by Puppy Zwolle - Wed Sep 20 05:42:15 2006

what is the effect of chromium coating on ceramic materials?
Q.
Asked by hari babu - Mon Mar 24 02:00:04 2008 - Chemistry - 2 Answers - Comments

A. Well I know Chromium is used in glazes because I've used ceramic glaze containing Chromium before. As far as I know it just gives the piece a metallic luster.
Answered by Johnny D - Mon Mar 24 02:09:49 2008

what are the 4 ceramic materials used to make dinnerware?
Q.
Asked by Bullys P - Mon Nov 16 13:50:08 2009 - Decorating & Remodeling - 1 Answers - Comments

A. Kaolin clay, ball clay, flint and feldspar.
Answered by - Thu Nov 19 13:29:27 2009

What corrodes ceramic materials?
Q. I (think) I understand that ceramic materials are naturally highly resistant to corrosion. Can someone advise me on what agents or solvents can corrode ceramics over a relatively short period of time? Page 11 from this book might be helpful if someone could put it into layman's terms or simple examples. Thanks in advance!
Asked by - Sat Apr 11 19:16:45 2009 - Chemistry - 2 Answers - Comments

A. Ceramics is a pretty broad field, so it's hard to generalize. It also depends on the temperature you're talking about. As things get hotter, more stuff will corrode ceramics. I'll assume that you're talking about near room temperature. Strong bases will corrode away silicates: Sodium Hydroxide (Na OH), better known as Lye or Drano will quickly corrode silicate-bonded ceramics. Lots of precision-cast metals (e.g.: aircraft parts, metal golf clubs) are made using a ceramic insert into the mold. The part then gets put into a basic solution and the ceramic is dissolved away. Certain strong acids will also corrode away silicate phases. The most common of these is Hydrofluoric Acid (HF), commonly used for glass etching, but H2SO4, HCl, etc. in… [cont.]
Answered by - Sun Apr 12 09:52:34 2009

why making ceramic materials by melting is not usual ?
Q.
Asked by idea123 - Mon Sep 21 03:37:00 2009 - Engineering - 3 Answers - Comments

A. Because then you're making glass.
Answered by - Mon Sep 21 09:39:49 2009

what is the reasonable cost (including labor/tax/materials) for ceramic tiling of kitchen about 300 sq ft?
Q. Live in Houston, Texas/ Just don't wanna get ripped off... medium quality ceramic tile...
Asked by somysterioso - Tue Aug 21 16:57:17 2007 - Decorating & Remodeling - 3 Answers - Comments

A. In GA, the installation costs are from $5-$10 a foot depending on details. The materials cost vary drastically depending on what you select. Let's say you select a ceramic tile from a big box retailer at $3 a foot. $3x300=$900 Lets say you get a quote for installation, which includes the grout and concrete board( there is a newer material, can't remember the name off hand) at $8 a foot. $8x300=$2400 $2400+900=$3300. Advice: 1. Shop around for a good price on the tile. You may not find your first choice, but one very close at a much better price. 2. Buy all the material needed yourself, the tile(concrete) board, the grout and the thinset. The bags will tell you the coverage and how much you will need. 3. Get a couple of quotes for… [cont.]
Answered by DZNR4U - Tue Aug 21 17:38:20 2007

how are glasses different from other ceramic materials?
Q.
Asked by sjdfhiujh - Sun Dec 12 15:59:33 2010 - Engineering - 2 Answers - Comments

A. Glass is totally amorphous - well mixed non-crystalline material - that at least has the potential for being transparent. Ceramic materials are vitrified in firing - meaning glass-like materials have formed in them - but always the vitrification is holding together non-glassy materials. Porcelain probably comes as close to glass in a ceramic as possible, and must be fired to a very high temperature, but it still has enough material in it that the very best and thinnest still only shows shadows through it.
Answered by - Sun Dec 12 16:09:38 2010

What are two materials a Kiln is made of?
Q. Also, are all ceramic materials considered safe? thank you!
Asked by Catherine L - Tue Apr 7 16:38:13 2009 - Sculpture - 2 Answers - Comments

A. Kilns are made of lots of things. Here are the major things: + The insulation is a type of high-temperature ceramic designed to trap air: Either a special clay brick or a special fiber. These are primarily alumina and silica. + The supports and shelves are made from similar materials, but they don't have any air in them. If it's gas, the burner tile is made from a higher-temperature version of this material. Again, these are mostly alumina and silica. Adding alumina and less silica makes things more temperature resistant. + If the kiln is electric, it has heating elements. These are made from a special Iron-Chrome-Aluminum alloy. + The outside shell is made from stainless steel, which is most likely an Iron-Chrome alloy. Are all ceramic… [cont.]
Answered by - Thu Apr 9 11:55:03 2009

describe how ceramic materials are made?and list five uses of ceramic materials?
Q. science help!! 10 points to first who answers!!!
Asked by - Wed Jun 9 09:25:56 2010 - Engineering - 1 Answers - Comments

A. Clay and sand and heat plates, toilets, sinks, pots, bowls
Answered by Sideburns - Wed Jun 9 10:14:26 2010

why ceramic materials are can not be recycled?
Q.
Asked by - Sun Feb 26 06:27:44 2012 - Engineering - 2 Answers - Comments