Abstract:
La présente invention se rapporte à un matériau métallique compacté et densifié comprenant une ou plusieurs phases formées d'un agglomérat de grains, la cohésion du matériau étant assurée par des ponts formés entre grains, ledit matériau ayant une densité relative supérieure ou égale à 95% et, préférentiellement, à 98%.
Abstract:
The invention relates to a method for manufacturing a composite material, wherein by dynamic densification of an amount of granular or powdered relatively brittle material or a mixture of one or more of such materials, a continuous porous product is obtained, whereafter, by infiltration thereof with a second material, the brittle material particles are embedded in a continuous network of the second material. The invention further relates to a composite comprising ceramic particles embedded in a continuous matrix of a second material, obtainable by a method according to the invention, and to products manufactured from such composite.
Abstract:
Methods for fabricating an interconnect for a fuel cell stack that include the steps of providing a metal powder, and rapidly compressing the metal powder, such as with a combustion-driven compaction apparatus, in a lubricant-free and/or sub-atmospheric environment to form the interconnect. The interconnect may have sufficient strength and density such that the interconnect may be incorporated into a fuel cell stack without performing a separate sintering and/or an oxidation step following the compressing.
Abstract:
Apparatus and method for shock-induced phase transformations in materials where two opposing shock waves pass coaxially through the material (22) to be shocked from either end of its axial dimension on a converging path to a point where the shock waves collide.
Abstract:
It is proposed that the gases produced by the explosion in an explosion chamber or autoclave are not allowed to expand, but are used to carry out other operations in the production of the solid product required.
Abstract:
A process for densely sintering metal powder, ceramic powder or a mixture thereof by conducting high-temperature heating in a short time under a super-high pressure of 100,000 atm or above. The high-temperature heating is conducted by causing a thermit reaction within a super-high pressure-generating apparatus equipped with a pyrophyllite gasket and a cylinder and an anvil having a heat insulator. Hexagonal boron nitride and/or tantalum barriers are arranged in place in the apparatus for preventing any reaction between the resulting thermit composition and sintered powder or heater and for electric insulation.
Abstract:
Interferenzschraube (1) mit Ausnehmungen (3) im Gewinde (2), die zum einen eine Verdrehsicherung bilden und zum anderen eine Gratbildung bei Entformung einer im Druckgussverfahren hergestellten Schraube verhindern.
Abstract:
A solid material for magnet containing a R-Fe-N-H type magnetic material as a primary component is produced by incorporating hydrogen into a rare earth element-iron-nitrogen type magnetic material powder having a rhombohedral or hexagonal crystal structure, preparing a green formed compact in a magnetic or non-magnetic field, and subjecting the green compact to a shock compaction by the use of an underwater shock wave while preventing the decomposition of a R-Fe-N-H type magnetic material by suppressing its residual temperature after the shock compaction to a temperature not higher than the decomposition temperature of the R-Fe-N-H material (ca. 600 DEG C at an ordinary pressure) through utilizing the characteristics of a shock compaction, such as ultra-high pressure shearing property, activating function and short time phenomenon.
Abstract:
The invention relates to a method for the production of a body made of hard metal, consisting of a hard compound A and a binder B, wherein pulverulent A and B, or an optionally precompacted article that contains A and B, are introduced into a container and the material containing A and B is compacted in order to increase the relative density (RD) to a value that is higher than 70% of the theoretical maximum density (TMD). The invention further relates to a body of hard metal comprising a hard compound A and a binder B, the mass ratio of A:B gradually changing over a cross-section of the body in order to impart to said body different mechanical properties in one zone Za or to one end (T) and hardness in one zone Zb or to another end (H). The invention also relates to the use of dynamic compaction techniques for the production of such bodies.