Hey Karl, have you worked with any pure silica rigidizers? I'm looking for something without any fluxes in it. I am going to mix up some of the fumed silica I have with water next week and test it on some fiber blanket. I was hoping someone knew good ratios. I'm looking to surface rigidize and also completely rigidize some shapes. With the surface rigidizing, goal is to make it strong so as to add a face coat without mashing down the fiber.
Pure silica rigidizer depend solely on Van der Waals Forces. Highly dispersed silica required.
I would not rely on that.
Just mix a small amount of your fumed silica with water let it dry and see if it satisfy you.
From what I have read, it is the binder that is used in forming ceramic fiber shapes from loose fibers and is the best option for rigidizing if you want to retain insulating values. Just was never sure on ratios with water.
So I did allot of digging and found some good info finally on some forge sites. ratio of about 3 parts powder to about 7 parts water seems to be a common average. One source said they use a cup of fumed silica to a pint of water with really good results.
From what I have learned, it is a very good idea to soak the blanket completely if it is going to receive a face coat so that their is not any weak fibers under the hard shell. The idea is you don't want to crush the fibers underneath so they all need rigidizing. I'm going to be doing a fiber board burn chamber and what a strong face coat for bumps from wood loading.
I will start a new thread once i start testing. Thanks for your input karl.
Post by smartliketruck on Feb 23, 2020 11:59:38 GMT -8
I do have some Glowmax, 55% phosphoric and a few different organic acids including citric. So I can give it a try. The Glowmax never worked well for low temperature setting with lye for me I called Plainsman Clays (If I remember right it was Tony Hansen of digital fire) about it about it and turns out Glowmax is calcined at 900°C+
I apologize I'm going off topic here, I'll start a new thread in the Geopolymer subsection for further discussion and edit this post to add the link.
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