Abstract:
A body comprising at least two components having one or more different properties and a method of producing the same are disclosed. One of the body components is in the form of particles with optional adhesive interlayers. A second of the components has a surface locally melted in a predetermined pattern and only to a predetermined depth by scanning an electron beam there across to incorporate the particles and form a metal composite film. Thereby, a predetermined volumetric concentration of the incorporated particles varies continuously from the locally melted surface so as to provide two surfaces in the body having different coefficients of thermal expansion.
Abstract:
A process is disclosed for restructuring crystalline grain structure and grain size of a material to produce an ultrafine-grain structure. An electron beam source is configured in relation to specific properties of a material forming a solid body to selectively irradiate a surface and a subsurface of that body with electrons at desired locations on the body and to create at least one selectively localized molten pool of defined size in the body. Heat is generated sufficiently rapidly by the beam source to create thermal gradients of sufficient magnitude to permit the body outside of the pool to act as a heat sink and rapidly cool the at least one molten pool, whereby an ultrafine-grain structure and grain size is produced by freezing grain growth upon occurrence of crystal nucleation.
Abstract:
An apparatus holds or stores at least one vial containing a vaccine or other material to be cryogenically preserved. The method passively regulates the rate of cooling for vaccines or other cryopreserved materials by using the enthalpy of fusion of at least one phase-change material (PCM) to control the rate of cooling when subject to a low temperature or cryogenic storage environment.
Abstract:
A body comprising at least two components having one or more different properties and a method of producing the same are disclosed. One of the body components is in the form of particles with optional adhesive interlayers. A second of the components has a surface locally melted in a predetermined pattern and only to a predetermined depth by scanning an electron beam there across to incorporate the particles and form a metal composite film. Thereby, a predetermined volumetric concentration of the incorporated particles varies continuously from the locally melted surface so as to provide two surfaces in the body having different coefficients of thermal expansion.