Title: Methods of synthesizing hydroxyapatite powders and bulk materials

Abstract

Methods are provided for producing non-porous controlled morphology hydroxyapatite granules of less than 8 .mu.m by a spray-drying process. Solid or hollow spheres or doughnuts can be formed by controlling the volume fraction and viscosity of the slurry as well as the spray-drying conditions. Methods of providing for homogenous cellular structure hydroxyapatite granules are also provided. Pores or channels or varying size and number can be formed by varying the temperature at which a hydroxyapatite slurry formed in basic, saturated ammonium hydroxide is spray-dried. Methods of providing non-porous controlled morphology hydroxyapatite granules in ammonium hydroxide are also provided. The hydroxyapatite granules and bulk materials formed by these methods are also provided.

Inventors:

Luo, Ping ^[1]

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1. 2843A Forest Ave., Berkeley, CA 94705

Issue Date:

Tue Jan 12 00:00:00 EST 1999

Research Org.:

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

OSTI Identifier:

872094

Patent Number(s):

5858318

Application Number:

08/757849

Assignee:

Luo, Ping (2843A Forest Ave., Berkeley, CA 94705)

Patent Classifications (CPCs):

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

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C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

C01B25/325 - {Preparation by double decomposition}

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

C04B35/447 - based on phosphates {, e.g. hydroxyapatite}
C04B35/622 - Forming processes

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DOE Contract Number:  

W-7405-ENG-48

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

methods; synthesizing; hydroxyapatite; powders; bulk; materials; provided; producing; non-porous; controlled; morphology; granules; spray-drying; process; solid; hollow; spheres; doughnuts; formed; controlling; volume; fraction; viscosity; slurry; conditions; providing; homogenous; cellular; structure; pores; channels; varying; size; temperature; basic; saturated; ammonium; hydroxide; spray-dried; volume fraction; ammonium hydroxide; slurry form; hollow spheres; bulk material; materials formed; drying process; varying size; hollow sphere; cellular structure; /423/501/