[Stoves] Tip from a Potter

[Craig Gallien]

If you want to try some experiments, try adding sawdust , cowdung, paper 
pulp, glass fibre, wire wool, rock wool, ceramic fibre, to the clay you have 
available to increase tensile strength and resistance to thermal shock. Fire 
in a kiln slowly before putting in stove , if it explodes you fired too fast 
or it wasnt dry enough.
Good luck
Craig


----- Original Message ----- 
From: "Charlie Sellers" <csellers42 at yahoo.com>
To: "Discussion of biomass cooking stoves" <stoves at listserv.repp.org>
Sent: Monday, December 03, 2007 11:43 PM
Subject: Re: [Stoves] Tip from a Potter


> Great!  I couldn't find the original post about coating metal, but I am 
> very interested in replacing metal grates with clay ones (Darfur and other 
> locations), to reduce costs and increase lifetime.
>
> Does anyone has data on clay grates - rolled clay with holes?  How thick? 
> I can start by drilling holes in clay tiles (baldosa?).
>
> Crispin, do you need a Pyrex grate for testing - I have a very reasonable 
> local borosilicate glass workshop here?  Bring to you at ETHOS?
>
> Charlie
>
>
>
> Craig Gallien <craiggallien at slingshot.co.nz> wrote: If you have trouble 
> with the durability of the parts of your stove ,
> particularly the grate, try coating the metal part in liquid clay.
>
> I use casting slip ( a mixture of clay, water, and a defloculant) to coat
> the vertical grate of my sawdust gasifier and it has increased its life 
> from
> a week to 2 months and counting. The grate is made from element wire from
> old electric heaters that is then woven into a mesh with a gap size of 
> about
> 1cm square.
>
> I spray it onto the mesh allowing it to dry between coats to build up a 1 
> or
> 2mm thickness, but dipping would work to.
>
> Thanks for everyone elses tips and ideas
> Craig
>
>
>
>
>
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