EP0257969A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Zirconia-modified alumina fiber
Assignee: EIDP Inc
•
Filing: 1987-08-19
•
Granted: —
•
Expires: 2007-08-19
Abstract
Abstract Alumina fiber modified by stabilized zirconia has improved strength and strength retention after high temperature exposure.
Inventors
- 👤 Michael Stephen Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 06:48
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/06; D; D01; D01F; D01F9/00; D01F9/08; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/62236; C04B35/6225
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
A ceramic fiber of from 10 to 25 microns in diameter containing at least 60% by weight of alpha alumina, between 15 and 25% by weight of zirconia in the tetragonal phase, and from 0.4 to 12 mole %, based on zirconia, of a zirconia stabilizer, the zirconia having a grain size of less than 0.5 microns, said fiber having a normalized light transmittance of 19% or less as measured in an inert fluid having a refractive index of 1.72.
Claim 2
Dependent Claim
80 words
A ceramic fiber of from 10 to 25 microns in diameter containing at least 60% by weight of alpha alumina, between 15 and 25% by weight of zirconia in the tetragonal phase, and from 0.4 to 12 mole %, based on zirconia, of a zirconia stabilizer, the zirconia having a grain size of less than 0.5 microns, said fiber having a normalized light transmittance of 19% or less as measured in an inert fluid having a refractive index of 1.72.
Claim 3
Dependent Claim
12 words
The fiber of claim 1 containing about 20% by weight of zirconia.
Claim 4
Dependent Claim
14 words
The fiber of claim 1 or Claim 2 wherein the zirconia stabilizer is yttria.
Claim 5
Dependent Claim
19 words
The fiber of any one of Claims 1 to 3 having a normalized light transmittance of 16% or less.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.