Method and mould for casting articles with a pre-determined...

Single-crystal – oriented-crystal – and epitaxy growth processes; – Processes of growth from liquid or supercritical state – Havin growth from molten state

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C117S083000, C164S122200, C164S122100

Reexamination Certificate

active

07449063

ABSTRACT:
Previously a number of techniques have been used in order to form single crystal or pre-determined crystallography components and articles. Each one of these techniques has its own particular problems, including susceptibility to error. By utilisation of a bi-crystal experiment to determine melt-back length LM and by consideration of the ingress distance d from potential initiation nucleation points on a perimeter of a seed crystal, it is possible to determine a maximum ingress length d. By ensuring that the maximum ingress length d is less than or equal to a seed crystal diameter R, it is possible to project locus from potential nucleation points C1, C2in terms of potential radii for stray grain propagation. As the seed crystal will have a known crystalline orientation, it will be possible to consider two divergent growth curves of the crystal in terms of the stray grains propagating from the point C1, C2. In such circumstances, a connector channel can be provided with a radius r=R/4 in an area between the periphery of the seed and the locus of the stray grain maximum ingress distances d. In situations where it is found d exceeds the crystal radius R, it will be understood that the actual crystal diameter R used may be increased or adjustment made with regard to the melt-back length LM in order to alter the maximum ingress distance d.

REFERENCES:
patent: 4412577 (1983-11-01), Salkeld et al.
patent: 4580613 (1986-04-01), Miller
patent: 1 577 496 (2005-09-01), None
patent: 2002293685 (2002-10-01), None
patent: 2002293685 (2002-10-01), None

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and mould for casting articles with a pre-determined... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and mould for casting articles with a pre-determined..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and mould for casting articles with a pre-determined... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-4040601

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.