Method of fabricating a refractory metal ceramic matrix composite
A method of fabricating a refractory metal ceramic matrix interpenetrating phase harsh environment capable composite is provided. The method includes forming a reinforcing phase by additive manufacturing and introducing a matrix material to the reinforcing phase. The step of introducing the matrix material may be performed by additive manufacturing or a densification process. The reinforcing phase may be a lattice formed of metal or a ceramic, and the matrix material may be a ceramic or a metal. Alternatively, the reinforcing phase formed by additive manufacturing is a laminate layer, and the matrix material introduced to the reinforcing phase is a laminate layer deposited on the reinforcing phase by additive manufacturing in a plurality of alternating layers. A refractory metal ceramic matrix composite is also disclosed. The refractory metal ceramic matrix composite includes a lattice formed by additive manufacturing, and a matrix material deposited in the lattice.
1. A method of fabricating a refractory-metal, ceramic-matrix composite, the method comprising:
forming a reinforcing phase by additive manufacturing, wherein the reinforcing phase is a lattice formed of a refractory metal that is one of tungsten (W) or molybdenum (Mo); and
introducing matrix material to the reinforcing phase in a two-cycle infiltration process including a first cycle and a second cycle, wherein in the first cycle the lattice is filled with a first matrix material in powder form, solvent binder is dripped into the lattice, the binder is cured, and the binder is burned out of the lattice, and in the second cycle a second matrix material is added to the lattice by chemical vapor infiltration;
wherein each of the first matrix material and the second matrix material is a ceramic, and either: i) the first matrix material and the second matrix material are both silicon carbide (SiC), or ii) the first matrix material is zirconium diboride (ZrB 2 ) and the second matrix material is SiC.
2. The method of claim 1 , wherein the lattice has a solid volume percent of between 30% and 45%.
3. The method of claim 1 , wherein the lattice includes a plurality of cells, and each of the plurality of cells of the lattice has a width in the range of 0.25 mm to 5 mm.
4. The method of claim 1 , wherein subsequent to the step of introducing the matrix material to the reinforcing phase, the method further includes sintering a product obtained by introducing the matrix material to the reinforcing phase.
5. The method of claim 1 , wherein the lattice has an X-shaped structure or a triply periodic minimal surface (TPMS) structure.