Materials for black chip resistant ceramic
Materials for black chip resistant ceramic
(OP)
Can anyone help with the following brief? For a jewellery and decoration application I'm trying to find some ideas on a formulation for a black or grey (for aesthetic reasons,) non-toxic/irritant ceramic which is hard, preferably quite chip resistant (through droping,) and does not fail explosively or in shards when it goes (i.e. fails benignly).
To give some further clarification, there is a reference at http://en.wikipedia.org/wiki/Ceramic to an (unhelpfully named) "High-tech ceramic" used in watches. There also exists a Black Vitreous Ceramic (BVC) used in telescope mirror production, the full properties of which are unclear.
I thought about some iron oxide or other transition metal oxide composition but need some more technical data first (Nickel, some Chromium options etc are likely ruled out on allergy & toxicity grounds). I'd like to pre press/form or cast the parts into shape and have presently a firing temperature limitation of 1300 Celcius.
If it's the only practical solution, I'd consider a coating, but accept that some compromises will be necessary.
A pointer to a good ceramic materials reference book, with materials properties and some chemistry and a technical rather than art and crafts approach would also be of help.
Many thanks in advance.
To give some further clarification, there is a reference at http://en.wikipedia.org/wiki/Ceramic to an (unhelpfully named) "High-tech ceramic" used in watches. There also exists a Black Vitreous Ceramic (BVC) used in telescope mirror production, the full properties of which are unclear.
I thought about some iron oxide or other transition metal oxide composition but need some more technical data first (Nickel, some Chromium options etc are likely ruled out on allergy & toxicity grounds). I'd like to pre press/form or cast the parts into shape and have presently a firing temperature limitation of 1300 Celcius.
If it's the only practical solution, I'd consider a coating, but accept that some compromises will be necessary.
A pointer to a good ceramic materials reference book, with materials properties and some chemistry and a technical rather than art and crafts approach would also be of help.
Many thanks in advance.





RE: Materials for black chip resistant ceramic
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Plymouth Tube
RE: Materials for black chip resistant ceramic
Sometime ago I made some earrings and pendents from glassy (vitreous) carbon. It is a little expensive but I got mine from as cast offs from the lab where I worked. I was going good until the lady that supplied the findings moved to California and I lost contact. I also experimented with some high density carbon foams by depositing different metals and cutting and polishing different shapes.
RE: Materials for black chip resistant ceramic
On the zirconium oxide option, I'm willing to experiment but this leads to a few further questions as I can only reach 1300 Celcius at present. What does one get from heating ZrO2 and for example Y2O3 over 1170 C (and not over 1300 C)? Stabilised cubic, stabilised tetragonal or just a mess on the floor of the furnace? And what if I introduce some transition metal oxide or ferrite for colouring purposes? Isn't this likely to destroy the structure at useful concentrations or might this work as a surface dopant?
RE: Materials for black chip resistant ceramic
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Plymouth Tube