Low-heat-transfer interface between metal parts

A method of coupling mating parts, the method comprising:

• roughening surfaces of a refractory-metal-containing first part, so as to reduce the contact area of the roughened surfaces;
• bringing the refractory-metal-containing first part into engagement with a second part, wherein the roughened surfaces are in contact with corresponding surfaces of the second part;
• and
• securing the parts together.

A missile control surface assembly comprising:

• a refractory-metal-containing leading edge;
• and
• a metal main body coupled to the leading edge;
• wherein the refractory-metal-containing leading edge has roughened surfaces that are in contact with coated surfaces of the main body;
• and
• wherein the roughened surfaces reduce contact area between the leading edge and the main body, relative to contact that would be produced by smooth surfaces in place of the rough surfaces, with the roughened surfaces area having a contact area reduction of 40% to 80% relative to the smooth surfaces.