POTASSIUM HEXATITANATE WHISKER HAVING TUNNEL STRUCTURE

摘要

PURPOSE: To obtain the subject whiskers for a fiber reinforced metal-based composite material having excellent thermal stability and ensuring higher strength by heat treatment by specifying the contents of Al and Nb as impurities. ;CONSTITUTION: The objective whiskers contain Al and Nb as impurities in i0.6 molar ratio of Al₂O₃ to Nb₂O₅. When the whiskers are used. the strength is not reduced during heat treatment and a composite material having excellent mechanical strength is obtd. The contents of impurities other than Al and Nb in the whiskers are preferably ≤1% (expressed in terms of oxides). The whiskers are typically produced as follows; a mixture of Ti- and K-contg. compds. as starting materials blended in a ratio giving K₂O.TiO₂ (n=2-4) is fired at 900-1,200°C to obtain massive potassium titanate whiskers, these whiskers are singly separated by immersion in water and an acid is added to adjust the pH to 9.3-9.7. After the compsn. is varied so as to attain 5.9-6.9 molar ratio of TiO₂ to K₂O, the whiskers are heated at 900-1,150°C for ≥1hr and washed with an acid.;COPYRIGHT: (C)1993,JPO&Japio