Formation of silicon carbide-silicon nitride nanoparticle carbon compositions
A composition having nanoparticles of silicon carbide and a carbonaceous matrix or silicon matrix. The composition is not in the form of a powder. A composition having silicon and an organic compound having a char yield of at least 60% by weight or a thermoset made from the organic compound. A method of combining silicon and the organic compound and heating to form silicon carbide or silicon nitride nanoparticles.
1. A composition comprising:
nanoparticles of silicon carbide; and
a carbonaceous matrix;
wherein the composition comprises at least 30% by weight of the nanoparticles;
wherein the composition is not in the form of a powder; and
wherein the composition is thermally stable at 3000° C.
2. The composition of claim 1 , wherein the composition comprises at least 99% by weight of the nanoparticles.
3. The composition of claim 1 , wherein the average diameter of the nanoparticles is less than 100 nm.
4. The composition of claim 1 , wherein the nanoparticles comprise α-SiC.
5. The composition of claim 1 , wherein the nanoparticles comprise β-SiC.
6. The composition of claim 1 , wherein the carbonaceous matrix comprises graphitic carbon, carbon nanotubes, or amorphous carbon.
7. The composition of claim 1 , wherein the composition further comprises:
nanoparticles comprising silicon nitride.
8. The composition of claim 1 , wherein the composition further comprises:
nanoparticles comprising silicon boron carbide.
9. The composition of claim 1 , wherein the composition further comprises:
fibers, carbon fibers, ceramic fibers, or metal fibers.
10. The composition of claim 1 , wherein the composition contains less than 20% by volume of voids.
11. An article comprising the composition of claim 1 , wherein the article is in the form of a solid, unbroken mass having a minimum size of at least 1 mm in all dimensions.
12. A composition comprising:
nanoparticles of silicon carbide; and
a silicon matrix;
wherein the composition comprises at least 70% by weight of the nanoparticles or the average diameter of the nanoparticles is less than 100 nm; and
wherein the composition is not in the form of a powder.
13. The composition of claim 12 , wherein the composition comprises at least 70% by weight of the nanoparticles.
14. The composition of claim 12 , wherein the composition comprises at least 99% by weight of the nanoparticles.
15. The composition of claim 12 , wherein the average diameter of the nanoparticles is less than 50 nm.
16. The composition of claim 12 , wherein the nanoparticles comprise α-SiC.
17. The composition of claim 12 , wherein the nanoparticles comprise β-SiC.
18. The composition of claim 12 , wherein the composition further comprises:
nanoparticles comprising silicon nitride.
19. The composition of claim 12 , wherein the composition further comprises:
nanoparticles comprising silicon boron carbide.
20. The composition of claim 12 , wherein the composition further comprises:
fibers, carbon fibers, ceramic fibers, or metal fibers.
21. The composition of claim 12 , wherein the composition contains less than 20% by volume of voids.
22. An article comprising the composition of claim 12 , wherein the article is in the form of a solid, unbroken mass having a minimum size of at least 1 mm in all dimensions.
23. A composition comprising:
nanoparticles of silicon carbide; and
a carbonaceous matrix comprising graphitic carbon, carbon nanotubes, or amorphous carbon;
wherein the composition is not in the form of a powder; and
wherein the composition comprises at least 30% by weight of the nanoparticles.
24. The composition of claim 23 , wherein the composition further comprises:
nanoparticles comprising silicon nitride.
25. The composition of claim 23 , wherein the composition further comprises:
nanoparticles comprising silicon boron carbide.
26. The composition of claim 23 , wherein the composition further comprises:
fibers, carbon fibers, ceramic fibers, or metal fibers.
27. An article comprising the composition of claim 23 , wherein the article is in the form of a solid, unbroken mass having a minimum size of at least 1 mm in all dimensions.
28. A composition comprising:
nanoparticles of silicon carbide; and
a carbonaceous matrix or silicon matrix;
wherein the composition is not in the form of a powder; and
wherein the nanoparticles in the composition have a continuous grain structure.
29. The composition of claim 28 , wherein the composition comprises at least 5% by weight of the nanoparticles.
30. The composition of claim 28 , wherein the carbonaceous matrix comprises graphitic carbon, carbon nanotubes, or amorphous carbon.
31. The composition of claim 28 , wherein the composition further comprises:
nanoparticles comprising silicon nitride.
32. The composition of claim 28 , wherein the composition further comprises:
nanoparticles comprising silicon boron carbide.
33. The composition of claim 28 , wherein the composition further comprises:
fibers, carbon fibers, ceramic fibers, or metal fibers.
34. An article comprising the composition of claim 28 , wherein the article is in the form of a solid, unbroken mass having a minimum size of at least 1 mm in all dimensions.