关键词: 粉煤灰, 碳粉, 电石渣, 多孔陶瓷, 渗透性能

Abstract:

Porous ceramics were prepared using fly ash as the main raw material,adding different kinds and different amounts of pore-forming agents (carbon powder:5%-50%;wood fiber 5%-30%;and carbide slag:0-50%,by mass),pressing under 100 MPa,and sintering at 1 100 ℃ for 2 h.The results show that (1)the apparent porosity,the average pore size,the gas permeability,and the nitrogen flux of the porous ceramics increase while their density decreases with the rising carbon powder addition;(2)with the increasing carbide slag addition,the apparent porosity,the gas permeability,and the nitrogen flux of the porous ceramics increase,the density decreases,while the average pore size remains almost unchanged;(3)as the wood fiber addition increases from 5% to 15%,the apparent porosity and the average pore size of the porous ceramics increase while the density decreases;as the wood fiber addition reaches 30%,the apparent porosity and the density of the porous ceramics remain unchanged,while the average pore size decreases gradually;the change of the gas permeability and the nitrogen flux shows no obvious trend;(4)the main phases of the porous ceramics prepared with carbon powder are quartz,anorthite and calcium silicate;while those with carbide slag are quartz,anorthite,gehlenite,and calcium silicate.Using carbon powder and carbide slag as pore forming agents,the properties and pore parameters of porous ceramics could be adjusted linearly by changing the addition of pore forming agents.

Key words: fly ash, carbon powder, carbide slag, porous ceramics, permeability properties