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Forming Precision Shapes from Powdered Materials

IP.com Disclosure Number: IPCOM000076556D
Original Publication Date: 1972-Mar-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Cullen, FM: AUTHOR [+3]

Abstract

Precision shapes from powdered materials are prepared by milling a powder to obtain a desired particle size, i.e., an alumina powder, A-16, can be used directly. A two-part binder is mixed and powder added to the composition: PART A PART B Heptanoic acid 37.5 gm 37.5 gm Cyclohexanone 375.0 gm Benzoyl peroxide 18.0 gm 2 Hydroxy propyl methacrylate 375.0 gm Propylene glycol dimethacrylate 75.0 gm Oleic acid 0.45 gm 0.45 gm A-16 alumina 862.00 gm 976.0 gm.

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Forming Precision Shapes from Powdered Materials

Precision shapes from powdered materials are prepared by milling a powder to obtain a desired particle size, i.e., an alumina powder, A-16, can be used directly. A two-part binder is mixed and powder added to the composition: PART A PART B Heptanoic acid 37.5 gm 37.5 gm Cyclohexanone 375.0 gm Benzoyl peroxide 18.0 gm 2 Hydroxy propyl methacrylate 375.0 gm Propylene glycol dimethacrylate 75.0 gm Oleic acid 0.45 gm 0.45 gm A-16 alumina 862.00 gm 976.0 gm.

The individual parts of the above composition are milled separately to prevent polymerization in the mill, since some heat is generated in milling.

Part A and Part B are then added and milled to produce complete dispersion of both parts A and B. The mix is then placed in a molding machine reservoir and outgassed thoroughly by reducing the pressure to about 1 mm of mercury, and vibrating with enough energy to cause the entire mass of material to flow in a rolling motion.

The viscosity of the mix is about 40,000 cps. The reservoir containing the mix is then attached to the molding machine. The machine is then cycled to produce parts defined by the mold cavities.

The castings thus prepared, are dried by raising the temperature in a controlled manner from about 70 degrees C to about 300 degrees C. The castings are then sintered under suitable conditions, i.e., time, temperature and atmosphere, for the material involved, for example, with A-16 alumina; sintering is at 15...