公开(公告)号：DE102004061700A1

公开(公告)日：2006-07-06

申请号：DE102004061700

申请日：2004-12-22

Applicant: DEGUSSA

Inventor： SCHUMACHER KAI ,  MOERTERS MARTIN ,  FLESCH JUERGEN ,  TWISTERN MARCUS VON ,  HAMM VOLKER ,  SCHMITT MATTHIAS ,  ALFF HARALD ,  SCHILLING ROLAND

IPC: C01F7/02 ,  C01F7/30

Abstract: Aluminum oxide powder in the form of aggregates of primary-particles, which has a BET surface area of from 10 to 90 m2/g and comprises as crystalline phases, in addition to gamma-aluminum oxide and/or theta-aluminum oxide, at least 30% of delta-aluminum oxide. It is prepared by vaporizing aluminum chloride and burning the vapor together with hydrogen and air, the ratio of primary air/secondary air being 0.01 to 2, the exit speed vB of the reaction mixture from the burner being at least 10 m/s, the lambda value being 1 to 4, the gamma value being 1 to 3 and the value of gamma*vB/lambda being greater than or equal to 55. Dispersion comprising the aluminum oxide powder. Coating composition comprising the dispersion.