Ut-battelle, Inc.

Kinga A Unocic

Govindarajan Muralidharan

Philip J Maziasz

Amelia M Elliott

Richard A Lowden

Bruce A Pint

Corson L Cramer

Ying Yang

Jacob W McMurray

A method for indirect additive manufacturing of an object constructed of boron carbide, silicon carbide, and free silicon, comprising: (i) producing a porous preform constructed of boron carbide and silicon carbide by an indirect ceramic additive manufacturing (ICAM) process in which particles of a powder mixture become bonded together with an organic binder, wherein the powder mixture comprises: a) boron carbide particles, and b) silicon carbide particles, wherein at least 80 vol % of the silicon carbide particles are larger than the boron carbide particles; and wherein the boron carbide and silicon carbide particles are each included in an amount of 40-60 wt. % of the powder mixture, provided that the foregoing amounts sum to at least 95 wt. %; (ii) subjecting the porous preform to a temperature of 500-900&#xb0; C. to volatilize the organic binder; and (iii) infiltrating molten silicon into pores of the porous preform to produce the object.

Indirect additive manufacturing process for producing SiC&#x2014;B4C&#x2014;Si composites

An air castable Fe-based stainless steel alloy comprises in weight % based on the total weight of the alloy 18-22% Cr, 15-22% Ni, 3-6% Al, 0.5-5% Mn, 0-3.5% W, 0-5% Cu, 0-2% Si, 1-2.5% Nb, 0.3-0.6% C balance Fe wherein, Cu+W+Si=0.5-10.5, and the alloy provides an oxidation resistance of 0.5&#x3c;specific mass change&#x3c;+2 mg/cmafter 400 one hour cycles at 900&#xb0; C. in 10% water vapor.

Low-cost cast creep-resistant austenitic stainless steels that form alumina for high temperature oxidation resistance

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Knoxville, TN, United States of America

Kinga A Unocic