Compositions: ceramic – Ceramic compositions – Refractory
Reexamination Certificate
2007-04-24
2007-04-24
Group, Karl (Department: 1755)
Compositions: ceramic
Ceramic compositions
Refractory
C501S136000
Reexamination Certificate
active
10895690
ABSTRACT:
Provided are a dielectric ceramic composition of forsterite system for microwave and millimeter-wave application and a method for forming the same. Here, the dielectric ceramic composition having a small dielectric loss is used for communication devices used at microwave and millimeter-wave bands. The dielectric ceramic composition includes forsterite (Mg2SiO4) as a main element and titanium oxide (TiO2), which is partially substituted for silicon (Si) in forsterite. The dielectric ceramic composition is obtained by using 56 to 57 wt % of MgO, 33 to 42 wt % of SiO2, and 1 to 11 wt % of TiO2, and adding an additive including Li ions as a sintering aid for improving a sintering characteristic. The dielectric ceramic composition is formed by mixing MgO, SiO2, and TiO2, calcining the mixture to form forsterite powder, adding an additive including Li ion, for example, Li2CO3, and shaping and sintering the mixture.
REFERENCES:
patent: 4608215 (1986-08-01), Gonczy et al.
patent: 5916834 (1999-06-01), Terashi et al.
patent: 6673731 (2004-01-01), Hahn et al.
patent: 05-116929 (1993-05-01), None
patent: 05-345662 (1993-12-01), None
patent: 2000-103641 (2000-04-01), None
patent: 2001-1130952 (2001-05-01), None
patent: 2002-104870 (2002-04-01), None
patent: 275192 (1971-02-01), None
Translation of Japanese document 2000-104870, Oct. 4, 2002.
S.R. Lacerda et al., “TIO2-induced phase separation and crystallization in SiO2-3CaOP2O5-MgO glass”, Journal of Non-Crystalline Solids 221 (1997) 255-260.
Matthew B.D. Mitchell et al., “Preparation and characterisation of forsterite (Mg2SiO4) aerogels”, Journal of Non-Crystalline Solids 225 (1998) 125-129.
Emad Mastafa et al., “Sintering and microstructure of spinel-forsterite bodies”, Ceramics International 28 (2002) 663-667.
“Microwave Dielectric Properties of Forsterite Based Ceramics”, D. Kim, et al., Proceeding of the Kieeme Annual Autumn Conference 2003, Nov. 13-15, 2003.
Jun Dong Suk
Kim Dong Young
Lee Hong Yeol
Lee Sang Seok
Blakely & Sokoloff, Taylor & Zafman
Electronics and Telecommunications Research Institute
Group Karl
LandOfFree
Dielectric ceramic composition of forsterite system for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dielectric ceramic composition of forsterite system for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dielectric ceramic composition of forsterite system for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3786524