[Stoves] "Vom Pyrolysekocher zur terra preta" Workshop 11-12.06. --> Clay TLUDs

[Crispin Pemberton-Pigott]

Dear Rebecca

 

Many things can be ‘tried’ but what is needed is a proper scientific exploration of the materials. This is routinely done for industrial applications, which is say, there are labs that specialise in this kind of work. We go to specialists for all sorts of things, why not the common materials we work with every day?

 

Calcium aluminate cement comes in a variety of formulations. Lots of them are not suited to stove components.

 

Adding liquid sodium silicate can strengthen most clays but there are many different clays.  Avoiding the 573 silica transition effect where silica changes in volume by 2% suddenly is a major concern for stove combustion chamber design. If that transition is not suppressed or eliminated, really hot parts just break after a few cycles, as few as 1 will do.

 

Using the local bricks in Muminabad a few weeks ago, we found that the floor of the fire chamber only lasted one firing before the stock bricks (house building) split into layers caused by differential thermal expansion, low tensile strength and a high compressive strength.  All three of these are contra-indications for suitability as a combustion chamber material.

 

Regards

Crispin

 

 

 

Has anyone heard of or tried mixing clay with calcium aluminate to enhance the clay's high thermal shock resistance?   My colleague and former treasurer of a seniors housing society used to work with Lafarge.  He suggested I contact Kerneos :which I did but no response to date.  Have a look at    http://kerneosinc.com/aboutus.php      .

 

Rebecca

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20160507/960c6236/attachment.html>