The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 02, 2010
Filed:
Jul. 15, 2005
Yukihisa Takeuchi, Nishikamo-Gun, JP;
Tsutomu Nanataki, Toyoake, JP;
Koichi Iwata, Kani, JP;
Katsuyuki Takeuchi, Aisai, JP;
Takuji Kimura, Kariya, JP;
Yukihisa Takeuchi, Nishikamo-Gun, JP;
Tsutomu Nanataki, Toyoake, JP;
Koichi Iwata, Kani, JP;
Katsuyuki Takeuchi, Aisai, JP;
Takuji Kimura, Kariya, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
A method for controlling the shrinkage of ceramic formed bodies is provided, including performing a preliminary test to determine an average shrinkage of ceramic formed bodies made from test lots of a ceramic powder, and determining a linear correlation between the average shrinkage and measured amounts of the ground test lots removed from a ball mill during a specific milling time interval. A batch of the ceramic powder is then ground, an amount of the ground ceramic powder removed from the ball mill during the specific time interval is measured, and the linear correlation is used to estimate the shrinkage of a ceramic body made therefrom. The difference between a target shrinkage and the estimated shrinkage is determined, and one or more of the processing conditions used to form the ceramic body are changed to offset the difference.