Low-adhesion material, resin molding die, and soil resistant...

Stock material or miscellaneous articles – Composite – Of inorganic material

Reexamination Certificate

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C428S689000, C428S699000, C428S701000, C428S702000

Reexamination Certificate

active

07901797

ABSTRACT:
An upper die has a cavity member constituting an inner bottom surface of a cavity, and a surrounding member. The cavity member is formed of a low adhesion material in accordance with the present invention, and includes a body portion and a surface layer formed on an undersurface of the body portion exposed to a fluid resin. The body portion is formed of a first material of 3YSZ and a second material of ZrN that are mixed at a predetermined ratio. The surface layer is formed of Y2O3having a low adhesion property with respect to a set resin, and has a thermal expansion coefficient smaller than that of the body portion. By bonding the body portion and the surface layer at a high temperature and then cooling them down, compressive residual stress is caused in the surface layer due to a difference in the thermal expansion coefficients thereof, and the compressive residual stress is present in the surface layer.

REFERENCES:
patent: 2005/0154113 (2005-07-01), Kuno et al.
patent: 2006/0093693 (2006-05-01), Kuno et al.
patent: 4-149074 (1992-05-01), None
patent: 4-364945 (1992-12-01), None
patent: 7-52120 (1995-02-01), None
patent: 2005-274478 (2005-10-01), None
patent: 2007-197251 (2007-08-01), None
patent: WO-2005/092587 (2005-10-01), None
Srinivasan et al., “R curve effects in solid particle erosion of ceramics”. Wear, 142 (1991) pp. 115-133.

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