Process for manufacture of dense neodymium stabilized...

Details Process for manufacture of dense neodymium stabilized... Process for manufacture of dense neodymium stabilized...

2006-09-19

2006-09-19

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Refractory

C501S097400, C501S098200, C501S098300, C264S683000

Reexamination Certificate

active

07109139

ABSTRACT:
The present invention provides a process for the manufacture of dense neodymium stabilized β-Si3N4-α-SiAlON composite, wherein a synergistic composition essentially consisting of Si3N4, Al2O3, AlN, SiO2and Nd2O3as starting materials is mixed in proportion to make a total of 100 mole in the mixed batch, passing the powder through 100 mesh, pressing the powder to form green compacts, sintering the green compacts at a temperature in the range of 1700° to 1900° C. in nitrogen atmosphere. The process of the present invention provides neodymium stabilized β-Si3N4-α-SiAlON composites by processing a composition from the system Si3N4—Al2O3.AlN—Nd2O3.9AlN—SiO2resulting into dense product of the order of >98% theoretical density with the advantages such as cost effectiveness, high hardness and high fracture toughness. The produced dense β-Si3N4-α-SiAlON will be useful for low temperature applications such as wear parts like bearing and roller materials and particularly for grinding and milling operations like grinding balls.

REFERENCES:
patent: 4421528 (1983-12-01), Buljan et al.
patent: 5032553 (1991-07-01), Tarry
patent: 5413972 (1995-05-01), Hwang et al.
patent: 5908798 (1999-06-01), Chen et al.
patent: 6824727 (2004-11-01), Roy et al.

Affiliated with

Also associated with

Rating

Process for manufacture of dense neodymium stabilized... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for manufacture of dense neodymium stabilized..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for manufacture of dense neodymium stabilized... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3591291