Composite materials comprising two jonal functions and methods for making the same

A composite material, comprising:

• (a) a permeable mass or preform comprising a plurality of bodies of at least one filler material;
• (b) a matrix embedding said permeable mass or preform;
• and
• (c) at least one coating disposed between said bodies of at least one filler material and said matrix, said at least one coating comprising boron, nitrogen and no more than about 3 atomic percent silicon;
• and
• (d) at least two zonal junctions, at least one of said zonal junctions being weak relative to the remaining zonal junction(s) to permit debonding and pull-out of said at least one filler material with respect to said matrix upon application of stress sufficient to cause fracture of said composite material.

A composite material, comprising:

• (a) a permeable mass or preform comprising a plurality of bodies of at least one filler material;
• (b) a matrix embedding said permeable mass or preform;
• and
• (c) at least one coating disposed between said bodies of at least one filler material and said matrix, said at least one coating comprising boron and nitrogen in roughly equal atomic proportions and no more than about 3 atomic percent silicon;
• and
• (d) at least two zonal junctions, at least one of said zonal junctions being weak relative to the remaining zonal junction(s) to permit debonding and pull-out of said at least one filler material with respect to said matrix upon application of stress sufficient to cause fracture of said composite material.

A composite material, comprising:

• (a) a permeable mass or preform comprising a plurality of bodies of at least one filler material;
• (b) a matrix embedding said permeable mass or preform;
• and
• (c) at least one coating disposed between said bodies of at least one filler material and said matrix, said at least one coating comprising boron nitride modified by silicon atoms, said silicon making up no more than about 3 atomic percent of said boron nitride;
• and
• (d) at least two zonal junctions, at least one of said zonal junctions being weak relative to the remaining zonal junction(s) to permit debonding and pull-out of said at least one filler material with respect to said matrix upon application of stress sufficient to cause fracture of said composite material.

A composite material, comprising:

• (a) a permeable mass or pre-form comprising a plurality of bodies of at least one filler material;
• (b) a matrix embedding said permeable mass or pre-form;
• (c) at least one coating disposed between said bodies of at least one filler material and said matrix, said at least one coating comprising boron nitride and silicon co-deposited by a chemical vapor deposition process at a temperature no greater than about 800° C.;
• and
• (d) at least two zonal junctions, at least one of said zonal junctions being weak relative to the remaining zonal junction(s) to permit debonding and pull-out of said at least one filler material upon application of stress sufficient to cause fracture of said composite material.