Ceramic and metal compositions

Inactive Publication Date: 2006-05-25
MATERIALS EVOLUTION & DEVMENT USA
View PDF14 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] In other specific embodiments, the metal particles may be microparticles or nanoparticles. The metal particles may have an average diameter less than the av

Problems solved by technology

Hybrid materials including both metals and ceramics have traditionally been difficult to form and have also been plagued with durability problems.
Many of these problems result from difficulties in filling void space within ceramics with a metal and with stable bonding between the metal and the ceramic.
Although attempts have been made to combine metals with ceramics, hybrid materials able to capitalize on the beneficial properties of both ceramics and metals still require additional development.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ceramic and metal compositions

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Ceramic Portion of Hybrid Materials

[0037] The preparation of some ceramics suitable for use as the ceramic portions of hybrid materials of the present invention is generally described in U.S. Pat. No. 5,951,295 (issued Sep. 14, 1999) and U.S. Pat. No. 6,291,547 (issued Sep. 18, 2002).

[0038] Ceramics can be prepared from: (1) from about 1% to about 50% by weight alumina; (2) from about 50% to about 98% by weight silica; and (3) from about 1% to about 5% by weight boron. In addition, the composition can further comprise silicon carbide up to about 3% by weight. The ceramics can comprise over 99% silica.

[0039] Generally, the process for preparing the ceramics can comprise the following steps (as described in U.S. Pat. No. 5,951,295): [0040] (1) preparation of a slurry mixture comprised of pre-measured amounts of purified fibers / materials and deionized water; [0041] (2) removal of shot from slurry mixture; [0042] (3) removal of water after thorough mixing to form a so...

example 2

Preparation of Metal Particle Suspension

[0056] A suspension of metal particles may be formed by addition of metal particles to water, alcohol or a combination thereof followed by agitation of the water. Up to 25% by volume metal may be suspended in the water in the present example. Smaller proportions, such as up to 2%, 5%, 10%, 15% or 20% metal particles by volume are also possible. The proportion of metal particles in the water may be varied to affect ease of maintaining a suspension, amount of particles deposited in the ceramic, and proportion of ceramic void space filled with particles. Metal particles may require repeated or frequent agitation in order to remain in suspension.

[0057] In one embodiment, copper nanoparticles may be prepared, for example, as in U.S. Pat. No. 6,346,136 then suspended in water.

example 3

Preparation of Hybrid Material

[0058] A hybrid material of the present invention may be prepared by placing a ceramic material of Example 1 in a chamber. A suspension of metal particles may be prepared according to Example 2. The particles should have an average diameter less than the average pore size of the ceramic. Preferably the average metal particle diameter will be less than two-thirds the average pore size of the ceramic.

[0059] The metal particle suspension may be poured into the ceramic and allowed to fill the chamber. The chamber may be agitated during or for some time after addition of the suspension. The ceramic may be allowed to remain undisturbed in the suspension for some time to allow the metal particles to settle in it.

[0060] The remaining suspension may then be drained from the bottom of the chamber and the ceramic dried. Metal particles will remain in the ceramic. If the particles are small in diameter compared to the average pore diameter of the ceramic, for i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Fractionaaaaaaaaaa
Fractionaaaaaaaaaa
Fractionaaaaaaaaaa
Login to View More

Abstract

A novel metal / ceramic hybrid material in which the void space of the ceramic is filled with metal. The metal may be bonded to the ceramic, for example by formation of a metal oxide. The metal may be introduced into the ceramic as small particles in a suspension then heated to melt the metal, allowing bonding to the ceramic or better filling of the void space. The hybrid material may be used in a variety of applications.

Description

FIELD OF THE INVENTION [0001] The present invention relates to compositions containing both metal and ceramic as well as methods of making and using such compositions. Specifically, it relates to a silica ceramic containing a metal within the void space formed by introducing metal particles into the void space. BACKGROUND [0002] Hybrid materials including both metals and ceramics have traditionally been difficult to form and have also been plagued with durability problems. Many of these problems result from difficulties in filling void space within ceramics with a metal and with stable bonding between the metal and the ceramic. [0003] Some such metal / ceramic hybrid materials for use in dentistry are described in U.S. Pat. No. 5,621,035. Specifically, the '035 patent describes filler compositions and ceramic enhanced dental materials. In one embodiment, the filler composition and the ceramic dental restorative material are comprised of about 22% by weight alumina, about 78% by weight...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): A61F13/00C04B33/34
CPCA61L27/025A61L27/105A61L27/427A61L27/56B22F3/114C04B30/02C04B35/18C04B35/62655C04B35/80C04B38/00C04B41/009C04B41/5127C04B41/88C04B2111/0031C04B2111/00836C04B2235/3409C04B2235/3826C04B2235/386C04B2235/5224C04B2235/5232C04B2235/77C22C1/08G01N33/551C04B41/0072C04B41/4539C04B41/4549C04B35/14C04B35/806C04B35/10C04B38/0054C04B41/4556C04B14/46C04B22/0013
InventorLYLES, MARK B.
OwnerMATERIALS EVOLUTION & DEVMENT USA