Method for inhibiting alkali metal volatilization during niobate base lead-free piezoelectric ceramic sintering process
Title：
Method for inhibiting alkali metal volatilization during niobate base lead-free piezoelectric ceramic sintering process
Application Number：
 200610112893
Application Date：
 2006/09/06
Announcement Date：
 2007/03/28
Pub. Date：
Publication Number：
 1935745
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 C04B 35/64, C04B 35/495
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
Key Words：
 inhibiting, niobate base lead-free piezoelectric ceramic, alkali metal volatilization
Abstract：
 The invention discloses a method for effectively inhibiting alkali metal volatilization in the course of sintering leadless columbate piezoelectric ceramic, called double-layer pot method for short: placing an alkali metal columbate inner pot with the component similar to that of the to-be-sintered material into a common alumina ceramic outer pot, and filling alkali metal columbate coating powder around the inner pot; and the concrete method: placing the pressed blank of the prefired alkali metal columbate ceramic into an alkali metal columbate inner pot with the similar component, then burying the inner pot into an outer pot holding alkali metal columbate coating powder with the component similar to that of the to-be-sintered ceramic, and making pressureless sintering in the atmosphere. And it can effectively inhibit the alkali metal volatilization in the sintering course, and obtains high-compactness ceramic block product whose piezoelectric constant is largely increased as compared with the alkali metal columbate ceramic sintered only by the coating powder.
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