Patent ID: 7384258

Claim:
A die for forming a honeycomb structure comprising: a plate-like die substrate having at least two surfaces, one surface including a back hole for introducing a green material, the other surface including a slit formed in such a manner as to communicate with the back hole and in which the green material introduced into the back hole is extruded from the slit to form the honeycomb structure; an underlayer disposed on the die substrate in such a manner as to coat at least a part of a portion constituting the back hole and the slit; an intermediate layer disposed in such a manner as to coat at least a part of the underlayer and constituted of tungsten carbide particles containing a main component of W 3 C and having an average particle diameter of 5 μm or less; and a surface layer which is disposed in such a manner as to coat at least a part of the intermediate layer and which is constituted of at least one of diamond and diamond-like carbon.