Insulating refractory material

Japanese: 耐火断熱材 - たいかだんねつざい(英語表記)insulating refractory material
Insulating refractory material
An insulating material with refractory properties, including insulating fire bricks and lightweight castable refractories (see the Castable Refractories section). Firebricks are used in the hottest part of the kiln, and fireproof insulating material is used on the outside to reduce the loss of thermal energy. The thermal conductivity of fireproof insulating material is low, about 1/5 to 1/10 that of refractories. Closed pores are the most effective way to provide insulation, and diatomaceous earth is generally manufactured from artificially made porous silica SiO 2 -alumina Al 2 O 3 type refractory raw materials, but natural diatomaceous earth is a high-silica fireproof insulating material that is cut into brick shapes and used as is.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
耐火物特性を有する断熱材で,耐火断熱煉瓦insulating fire brickと軽量キャスタブル耐火物(〈キャスタブル耐火物〉の項参照)がある。窯炉の最高温部に耐火煉瓦を使用し,その外側に耐火断熱材を用いて,熱エネルギーの発散を少なくする。耐火断熱材の熱伝導率は耐火物の1/5~1/10と小さい。断熱性を与えるには密閉した気孔が最も有効であり,一般にシリカSiO2‐アルミナAl2O3系の耐火原料を人工的に多孔質化したものを原料として製造されるが,天然のケイ藻土はそのまま煉瓦形状に切り出して使用される高シリカ質の耐火断熱材である。

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