Ivor and Olive Lewis on sat 18 sep 04
Dear Friends,
Graduation Question.
Plastic Clay is mainly a mixture of Clay Minerals and Water.
(a) Compare and contrast two plausible causes of plasticity, one where =
the water behaves as a liquid, the other where water behaves as a solid.
(b) If you were told that water occupies more than fifty percent of the =
volume of any plastic clay, which of these causes of plasticity seems =
most reasonable. What evidence would support you claim?
Mel wrote Physics and Chemistry so this is a legitimate ask for anyone =
who wishes to be proficient with clayart skills.
Best regards.
Ivor Lewis.
Redhill,
S. Australia.
Christy Pines on sun 19 sep 04
My copy of "Introduction to Ceramics: Kingery, Bowen, Ulman; Second
Edition" doe not reference "plasticity" in the index. The table of
contents provides access to a chapter on "Plastic Deformation, Viscous
Flow, and Creep" along with one on "Elasticity, Anelasticity and
Strength" but both chapters refer to the properties of the crystals
within the fired ceramic and the points of stress that can cause them to
fail, not about the raw materials and water as related to plasticity.
Indeed, Chapter 10 states that "During the usual processing of ceramics,
crystalline or noncrystalline powders are compacted and then fired at a
temperature dufficient to develop useful properties." - So clearly, this
text has no interest in the effect of water in plasticity of a clay
body, and therefore gives me no guidance. Not that I'm not learning from
reading these, just not getting closer to being able to answer your
questions.
Can you help out those who are still in high school on this topic
(although well beyond the typical high school age ) and suggest a
way to try to discover the answers to your questions?
Christy in Connecticut
Potters Council Member
cpines at ix.netcom.com
Ivor and Olive Lewis wrote:
>Dear Friends,
>Graduation Question.
>Plastic Clay is mainly a mixture of Clay Minerals and Water.
>(a) Compare and contrast two plausible causes of plasticity, one where the water behaves as a liquid, the other where water behaves as a solid.
>(b) If you were told that water occupies more than fifty percent of the volume of any plastic clay, which of these causes of plasticity seems most reasonable. What evidence would support you claim?
>Mel wrote Physics and Chemistry so this is a legitimate ask for anyone who wishes to be proficient with clayart skills.
>Best regards.
>Ivor Lewis.
>Redhill,
>
Hank Murrow on sun 19 sep 04
Dear Christy;
One way to generate questions might be to use glass lab slides to
magnify and emulate the behavior of clay particles. For instance, one
might see how they behave when dry, then add a drop of water, then add
more water......... watching how they slide but do not pull apart. Once
that image is understood, one might then change the alkalinity of the
water to see if that makes a difference. Though the actual clay
particles are are 10,000 times smaller than such large models, one may
begin toe 'see' by inference how the unseen clay particles are
behaving.......... and understand their medium much better.
Cheers, Hank in Eugene
www.murrow.biz/hank
On Sep 19, 2004, at 6:40 AM, Christy Pines wrote:
> My copy of "Introduction to Ceramics: Kingery, Bowen, Ulman; Second
> Edition" doe not reference "plasticity" in the index. The table of
> contents provides access to a chapter on "Plastic Deformation, Viscous
> Flow, and Creep" along with one on "Elasticity, Anelasticity and
> Strength" but both chapters refer to the properties of the crystals
> within the fired ceramic and the points of stress that can cause them
> to
> fail, not about the raw materials and water as related to plasticity.
> Indeed, Chapter 10 states that "During the usual processing of
> ceramics,
> crystalline or noncrystalline powders are compacted and then fired at a
> temperature dufficient to develop useful properties." - So clearly,
> this
> text has no interest in the effect of water in plasticity of a clay
> body, and therefore gives me no guidance. Not that I'm not learning
> from
> reading these, just not getting closer to being able to answer your
> questions.
>
> Can you help out those who are still in high school on this topic
> (although well beyond the typical high school age ) and suggest a
> way to try to discover the answers to your questions?
Ivor and Olive Lewis on mon 20 sep 04
Dear Hank,
You miss the point.
I would like you to have a go at the problem I posted. Christy was
seeking clarrification form me. I have sent that by private mail.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
Graduation Question.
Plastic Clay is mainly a mixture of Clay Minerals and Water.
a) Compare and contrast two plausible causes of plasticity, one where
the water behaves as a liquid, the other where water behaves as a
solid.
b) If you were told that water occupies more than fifty percent of
the volume of any plastic clay, which of these causes of plasticity
seems most reasonable. What evidence would support you claim?
Ivor and Olive Lewis on mon 20 sep 04
Dear Friends,
I have replied by private message to Christy Pines.
As Mel says, Physics and Chemistry.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
> My copy of "Introduction to Ceramics: Kingery, Bowen, Ulman; Second
> Edition" doe not reference "plasticity" in the index. The table of
> contents provides access to a chapter on "Plastic Deformation,
Viscous
> Flow, and Creep" along with one on "Elasticity, Anelasticity and
> Strength" but both chapters refer to the properties of the crystals
> within the fired ceramic and the points of stress that can cause
them to
> fail, not about the raw materials and water as related to
plasticity.
> Indeed, Chapter 10 states that "During the usual processing of
ceramics,
> crystalline or noncrystalline powders are compacted and then fired
at a
> temperature dufficient to develop useful properties." - So clearly,
this
> text has no interest in the effect of water in plasticity of a clay
> body, and therefore gives me no guidance. Not that I'm not learning
from
> reading these, just not getting closer to being able to answer your
> questions.
>
> Can you help out those who are still in high school on this topic
> (although well beyond the typical high school age ) and
suggest a
> way to try to discover the answers to your questions?
>
> Christy in Connecticut
> Potters Council Member
> cpines at ix.netcom.com
>
>
> Ivor and Olive Lewis wrote:
>
Dear Friends,
Graduation Question.
Plastic Clay is mainly a mixture of Clay Minerals and Water.
a) Compare and contrast two plausible causes of plasticity, one where
the water behaves as a liquid, the other where water behaves as a
solid.
b) If you were told that water occupies more than fifty percent of
the volume of any plastic clay, which of these causes of plasticity
seems most reasonable. What evidence would support you claim?
.
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