Method of ceramic preparation
AssigneeBell Telephone Laboratories, Incorporated
InventorsDavid W. Johnson, Jr., Man F. Yan
Life of this patent
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Abstract
Preparation of ceramic materials, including ferrites and garnets, through a processing sequence that includes a sintering step is facilitated by a flux, having a relatively low melting temperature and an approximately eutectic composition consisting of two or more of the final ceramic components. The flux permits the sintering step to proceed at temperatures lower than otherwise possible, and results in better control of the final ceramic composition and microstructure.
Claims15
A method of producing a ceramic material of final specified composition having desired characteristics, said material having at least two cations, comprising:
- mixing a first particle composition and a second particle composition, said first and said second particle compositions having different compositions, said first and said second particle compositions forming said final specified composition, and
- sintering said first and said second particle composition characterized in that said first particle composition forms at least 0.2 weight percent of said final specified composition and has an approximately eutectic composition and has at least two cations of said final composition in relative amounts differing from the relative amounts of said cations in said final specified composition in which the melting temperature of said first particle composition is lower than the melting temperature of said final specified composition, and in which said second particle composition contains at least one cation of said final specified composition whereby said final specified composition is produced under expedited sintering conditions without deviation from said desired characteristics of said final composition.
Dependencies are inferred from the claim text.