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    • 6. 发明授权
    • Method of producing a conductive silicon carbide-based sintered compact
    • 制造导电碳化硅类烧结体的方法
    • US06187256B1
    • 2001-02-13
    • US09051375
    • 1998-04-08
    • Mesut AslanRüdiger NassHelmut Schmidt
    • Mesut AslanRüdiger NassHelmut Schmidt
    • C04B35565
    • H05B3/148C04B35/565F01N3/022F01N2330/14
    • A process is described for producing a conductive sintered body based on silicon carbide, in which a) silicon carbide particles, optionally pretreated with a surface modifier, are dispersed in an aqueous and/or organic medium and positive or negative surface charges are generated on the silicon carbide particles by adjustment of the pH of the dispersion obtained; b) carbon black and boron carbide are mixed in as sintering aids, where at least the carbon black particles have a surface charge opposite to the surface charge of the silicon carbide particles and the boron carbide can also be added, completely or in part, at a later point in time (stage c′)); c) the slip thus obtained is shaped directly to form a green body or c′) a sinterable powder is isolated from the slip obtained and is shaped to form a green body, where the above boron carbide can also be added to this sinterable powder; and d) the green body obtained is subjected to pressureless sintering to form a sintered body in essentially three successive steps, namely (i) preheating to 1200-1900° C. in a nitrogen containing atmosphere (ii), sintering at 1900-2200° C. in a noble gas atmospher and (iii) post-heating at 2150-1850° C. and subsequent cooling to ambient temperature in an atomosphere containing nitrogen and/or carbon monoxide.
    • 描述了一种用于制造基于碳化硅的导电烧结体的方法,其中a)任选地用表面改性剂预处理的碳化硅颗粒分散在水性和/或有机介质中,并且在硅上产生正或负表面电荷 碳化物颗粒通过调节获得的分散体的pH调节; b)炭黑和碳化硼作为烧结助剂混合,其中至少炭黑颗粒具有与碳化硅颗粒和硼的表面电荷相反的表面电荷 也可以在稍后的时间点(阶段c')完全或部分地添加碳化物; c)由此获得的滑移物直接成形以形成生坯体,或者从可获​​得的滑动体中分离出可烧结粉末 并且成形为形成生坯体,其中也可以将上述碳化硼添加到该可烧结粉末中; 和)将所得生坯进行无压烧结,以基本上三个连续的步骤形成烧结体,即(i)在含氮气氛(ii)中预热至1200-1900℃,在1900-2200℃烧结 在惰性气体气氛中和(iii)在2150-1850℃下进行后加热,随后在含有氮和/或一氧化碳的大气中冷却至环境温度。