Nickel-catalyzed Construction of Heat Conductive Network in Electrically Calcined Anthracite (ECA) Based Carbon Block

摘要

Nickel nitrate was introduced into carbon blocks by using ECA aggregates as catalyst-carrier.The Ni-containing anthracite aggregates were firstly prepared by mixing anthracite aggregates in nickel nitrate ethanol solution and then incorporated into carbon blocks after pre-treating.The phase compositions, microstructures and properties of all carbon blocks fired at 1000 ℃ and 1400 ℃ in a coke bed were studied with the aid of X-ray diffraction, field emission scanning electron microscope, mercury porosimetry and a laser thermal conductivity meter.The results showed that the addition of Ni-containing anthracite aggregates promoted the formation of one-dimensional nanocarbon and β-SiC whiskers at 1000 ℃ and the growth of β-SiAlON at 1400 ℃,respectively.Moreover, the cold compressive strength and microporosity characteristics of carbon blocks with addition of Ni-containing anthracite aggregates were enhanced and the thermal conductivity was remarkably improved attributing to the high heat conductive network formed by the ceramic phases.