Carbon foam tooling with durable skin
View Patent ↗An article for tooling composite materials, including a carbon foam, a sealant attached to the carbon foam so as to form a monolithic fine-grain graphite-like surface; and a skin of facesheet materials. The facesheet materials include: a spray-deposited coating of metal; more preferably, a thermal or plasma spray-deposited metal; and most preferably, a plasma sprayed Invar metal. The facesheet materials may optionally include a flash coating. The facesheet materials alternately include plastics, resinous materials and carbon-carbon composite materials.
1. An article for tooling composite materials, the article comprising:
a carbon foam having a pore distribution such that at least about 90% of the pore volume comprises pores having a diameter of between about 10 microns and about 150 microns and at least about 1% of the pore volume comprises pores having a diameter of between about 0.8 microns and about 3.5 microns;
a sealant attached to the carbon foam; and
a skin attached to the sealant, the skin having a tooling surface,
wherein the sealant comprises a filler having of two sets of filler particles including a first filler fraction and a second filler fraction, the filler fractions having differing particle size distributions.
2. The article of claim 1 , wherein the skin comprises a metal.
3. The article of claim 2 , wherein the metal skin comprises a plasma spray deposited coating of an iron-nickel metal alloy.
4. The article of claim 1 , wherein the average diameter of the particles of the first filler fraction is at least twice the average diameter of the particles of the second filler fraction.
5. The sealant of claim 1 , wherein the particles of the first filler fraction have an average diameter of less than about 120 microns.
6. The article of claim 1 , wherein the particles of the second filler fraction have an average diameter of between about 0.2 to about 10 microns.
7. The article of claim 1 , wherein the first filler fraction comprises between about 12% to about 50% of the sealant by weight.
8. The article of claim 1 , wherein the second filler fraction comprises about 8% to about 35% of the sealant by weight.
9. The article of claim 1 , wherein at least 80% of the particles of the first filler fraction are between about 2 microns and about 500 microns in diameter.
10. The article of claim 1 , wherein the first filler fraction and the second filler fraction each comprise carbonaceous particles.
11. The article of claim 10 , wherein the first filler fraction comprises particles of coke, coal or graphite and the second filler fraction comprises particles of carbon black.