Abstract:
Disclosed is a method for additively manufacturing a sintered article from a powder composition comprising granules of cemented carbide or cermet. The method comprises the steps of additively manufacturing (102) a bottom portion by depositing a plurality of layers of powder composition, and adding binder to the entire surface of each layer of the bottom portion. The method further comprises additively manufacturing (104) a middle portion by depositing a plurality of layers of powder composition, and adding binder to only the outer parts of each layer of the middle portion. The method further comprises additively manufacturing (106) a top portion by depositing a plurality of layers of powder composition, and adding binder to the entire surface of each layer of the top portion, thereby producing a printed article, and sintering (108) the printed article, wherein the porosity of the granules in the powder is 0 – 15 wt%.
Abstract:
본 발명은 제1 기지와; 상기 제1 기지와 계면을 경계로 하여 구분되는 제2 기지;를 포함하고, 상기 계면은 상기 계면을 구성하는 계면 물질로 이루어지며, 상기 계면 물질은 상기 제1 기지 및 상기 제2 기지와 정합(coherent) 또는 반정합(semi-coherent)을 유지하고; 상기 제1 기지 및 상기 제2 기지와 화학적으로 서로 다른 조성을 가지는 원자 층을 적어도 한층 이상 포함하며; 상기 계면에서 존재하는 조성과 벌크 상태로 존재할 때의 조성이 서로 다른 것을 특징으로 하는 복합 재료에 관한 것이다. 본 발명에 따른 복합재료는, 제1 기지와 제2 기지 간의 계면에, 상기 제1 기지 또는 제2 기지를 구성하는 물질로부터 열역학적으로 안정하며 제1 기지와 제2 기지와는 다른 조성의 새로운 계면 물질을 포함할 수 있다. 이를 통해 본 발명의 복합 재료는 제1 기지와 제2 기지의 계면 결합력을 향상시킬 수 있다.
Abstract:
Systems and methods for making ceramic powders configured with consistent, tailored characteristics and/or properties are provided herein. In some embodiments a system for making ceramic powders, includes: a reactor body having a reaction chamber and configured with a heat source to provide a hot zone along the reaction chamber; a sweep gas inlet configured to direct a sweep gas into the reaction chamber and a sweep gas outlet configured to direct an exhaust gas from the reaction chamber, a plurality of containers, within the reactor body, configured to retain at least one preform, wherein each container is configured to permit the sweep gas to flow therethrough, wherein the preform is configured to permit the sweep gas to flow there through, such that the precursor mixture is reacted in the hot zone to form a ceramic powder product having uniform properties.
Abstract:
Es wird ein Hartmetall-Cermet-Verbundwerkstoff (1) bereitgestellt, mit: einer zusammenhängenden Phase (2) aus Wolframkarbid-basiertem Hartmetall, die einen metallischen Binder (2b) aus Co, Ni, Fe oder einer Legierung von diesen und in dem metallischen Binder (2b) eingebettete Wolframkarbid-Teilchen (2a) aufweist; in der zusammenhängenden Phase (2) eingebetteten verteilten Bereichen (3) eines Titankarbid-, Titannitrid-, Titankarbonitrid-, Niobkarbid-, Niobkarbonitrid- oder Niobnitrid-basierten Cermets, die einen zweiten metallischen Binder (3b) aus Co, Ni, Fe oder einer Legierung von diesen und in dem zweiten metallischen Binder (3b) eingebettete Hartstoffteilchen (3a) aufweist, wobei zumindest 97 Vol.-% der eingebetteten Bereiche (3) des Cermets einen längsten Durchmesser
Abstract:
A multi-grade composite article of a plurality of cemented carbide composite materials twist extruded together, at least two of the cemented carbide composite materials having a different composition. A method of forming a multi-grade composite article includes the steps of providing a plurality of different cemented carbide composite materials; positioning the plurality of cemented carbide composite materials in an extrusion device; and extruding and twisting the plurality of cemented carbide composite materials to form the multi-grade composite article.
Abstract:
Compositions and methods for applying to a surface an overlay comprising titanium carbide are provided. The compositions include rounded titanium carbide particles and optionally include angular titanium carbide particles. The compositions may be applied, for example, by plasma transferred arc or spray/fuse deposition.