In many heat treatment processes, refractory is used, and I think that the dust particles generated from the refractory causes a lot of problems. I want to find a reference to support this, but it's not easy. There are many reports that the refractory is destroyed by thermal shock, but I could't find reference to deal with dust particles detailed. If there is a reference that explains the mechanism of dust particles generation in refractory materials, please introduce it. A reference to any material other than refractory also seems to be helpful. Thank you.