Particulate composite ceramic material, part comprising said material, and method for the preparation of said part

A particulate composite ceramic material, comprising:

• particles comprising a first ultra-high-temperature ceramic in crystallized form, an outer surface of the particles being at least partially covered by a porous layer comprising a second ultra-high-temperature ceramic in amorphous form, the first ultra-high-temperature ceramic being present in a range of from 25 to 90 mass %, and the second ultra-high-temperature ceramic being present in a range of from 2 to 15 mass %, each with respect to total particulate composite ceramic material mass, and the particles defining a space therebetween;
• optionally, porous clusters of the second ultra-high-temperature ceramic in amorphous form, distributed in the space;
• a dense matrix comprising a third ultra-high-temperature ceramic in crystallized form at least partially filling the space;
• optionally, a dense coating comprising the third ultra-high-temperature ceramic in crystallized form, covering the outer surface of the dense matrix,
• wherein the dense matrix and, optionally further the dense coating, are present in a range of from 5 to 90 mass %, with respect to the total particulate composite ceramic material mass,
• wherein the porosity of the porous layer is in a range of from 15 to 30%,
• wherein the first, second, and third ultra-high-temperature ceramics comprise a boride, carbide, nitride, silicide, and/or carbon.