High thermal conductivity shell molds
View Patent ↗A shell mold is described. The shell mold includes a facecoat, a sealcoat, and a support disposed in between the facecoat and the sealcoat. The support includes a stucco in a concentration greater than about 40 volume percent of the support. The stucco includes a material that has a thermal conductivity greater than about 285 W/m-K.
1. A shell mold, comprising:
a facecoat disposed on an inner surface of the shell mold;
a sealcoat disposed on an outer surface of the shell mold; and
a support in between the facecoat and sealcoat, comprising a stucco in a concentration greater than about 40 volume percent of the support, wherein the stucco comprises a material having a thermal conductivity greater than 285 W/m-K.
2. The shell mold of claim 1 , wherein the stucco comprises a plurality of ceramic particulates, and wherein a median size of the plurality of particulates is greater than about 80 microns.
3. The shell mold of claim 2 , wherein the median size of the plurality of particulates is in a range from about 100 microns to about 300 microns.
4. The shell mold of claim 1 , wherein the material comprises silicon carbide, aluminum nitride, diamond, graphite, or a combination of any of the foregoing.
5. The shell mold of claim 4 , wherein the stucco is made of silicon carbide material.
6. The shell mold of claim 1 , wherein the support further comprises silica.
7. The shell mold of claim 1 , wherein the support further comprises alumina fine particle dispersion.
8. The shell mold of claim 1 , wherein the support has a thickness less than about 8 mm.
9. The shell mold of claim 1 , wherein the shell mold has a thermal conductivity value greater than about 2 W/m-K.
10. The shell mold of claim 1 , wherein the support comprises multiple layers.
11. The shell mold of claim 1 , wherein the concentration of stucco is greater than about 50 volume percent of the support.
12. The shell mold of claim 1 , wherein the facecoat comprises alumina, chromia, and titania particles.
13. The shell mold of claim 1 , wherein the sealcoat comprises a coating having higher emissivity relative to an alumina coating.
14. The shell mold of claim 1 , wherein the sealcoat comprises silicon carbide particles.
15. A shell mold, comprising:
a facecoat comprising alumina, disposed on an inner surface of the shell mold;
a high emissivity sealcoat disposed on an outer surface of the shell mold; and
a support in between the facecoat and sealcoat, comprising silicon carbide stucco, greater than about 50 volume percent of the support in an alumina fine particle dispersion, wherein a median size of particulates of silicon carbide stucco is greater than about 100 microns, and a thickness of the shell mold is less than about 7 mm.