Method of making articles having internal surface of desired contour and articles produced thereby

Claim 1

METHOD OF FABRICATING METAL ARTICLES HAVING AN INTERNAL SURFACE OF BUILD-UP DEPOSITED LAYER MATERIAL CONSISTING ESSENTIALLY OF REFRACTORY HARD SURFACING MATERIAL COMPRISING PROVIDING A TEMPORARY MALE MASTER HAVING AN EXTERNAL SURFACE OF METAL HAVING A MELTING POINT OVER 600* F. AND COMPLEMENTARY IN CONTOUR TO THE DESIRED INTERNAL SURFACE, DETONATING A BODY OF GAS CONTAINING PARTICLES CONSISTING ESSENTIALLY OF SAID REFRACTORY HARD FACING MATERIAL THEREIN, DIRECTING THE PRODUCTS OF SAID DETONATION AGAINST SAID EXTERNAL METAL SURFACE OF SAID MASTER, THEREBY APPLYING A COATING OF SUCH DEPOSITED ESSENTIALLY REFRACTORY HARD SURFACED LAYER MATERIAL TO SAID EXTERNAL SURFACE OF SAID TEMPORARY MALE MASTER, COVERING SAID COATING OF DEPOSITED ESSENTIALLY REFRACTORY HARD SURFACED LAYER MATERIAL WITH A SUITABLE BACK-UP MATERIAL COATING TO THE DESIRED THICKNESS TO FORM AN ASSEMBLY, AND REMOVING SAID TEMPORARY MALE MASTER FROM SAID ASSEMBLY TO PRODUCE AN ARTICLE HAVING AN INTERNAL SURFACE OF BUILT-UP DEPOSITED ESSENTIALLY REFRACTORY HARD SURFACING LAYER MATERIAL.