| 摘要 |
An electrically conducting article is prepared by forming a body from an intimate mixture of amorphous carbon and metal of the iron group (Fe, Co and Ni), amounting to at least 5% by weight of the mixture, and heating the body to 1300 DEG to 1700 DEG C. to graphitize the carbon until the resistivity does not exceed 2000 micro-ohms per centimetre cube. The body may be formed by moulding or extruding a mixture of granular coke, including some graphite powder or coke scrap, metal and a carbonaceous binder, e.g. coal tar pitch or a thermosetting resin, to form a "green" compact which is baked before graphitization. In one embodiment the mixture of coke and metal is prepared by carbonizing a mixture of iron oxide and coal. A graphitization promoter may be incorporated in the body, e.g. Al, Si or Ni in the form of an iron-rich alloy. When the Si is in the form of ferrosilicon, the iron content therein constitutes some or all of the iron required. In the examples, are furnace electrodes are prepared. |
