Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Keramikkörpers, der aus zwei monolithisch miteinander verbundenen Zonen, die sich hinsichtlich ihrer Porenstruktur unterscheiden, aufgebaut ist. Das erfindungsgemäße Verfahren beruht insbesondere auf der Kombination von Gefriergießen (Freeze Casting) und Schlickergußverfahren.
Abstract:
본 발명은 상온진공과립분사 공정을 위한 취성재료 과립 및 이를 이용한 코 팅층의 형성방법에 관한 것으로, 더욱 상세하게는 0.1 내지 6 ㎛ 크기의 미립자 분말이 과립화되어 상온진공과립분사 공정을 통해 코팅층을 형성할 수 있는 것을 특징으로 하는 취성재료 과립 및 이를 이용한 코팅층의 형성방법을 제공한다. 본 발명에 따른 취성재료 과립은 상온진공과립분사 공정을 통해 과립을 공급하며 연속 적으로 코팅공정을 수행할 수 있고, 노즐을 통해 분사되는 과립의 질량이 상대적으 로 큼에 따라 높은 운동에너지를 나타내어 낮은 가스 유량에서도 코팅층을 제조할 수 있으며, 성막 속도를 증가시킬 수 있어 세라믹 코팅층 제조에 유용하게 사용할 수 있다. 또한, 본 발명에 따른 코팅층 형성방법을 통해 10% 이하의 기공율을 나타 내며, 균열이나 거대 기공 또는 층상구조와 같은 불균일성이 없는 균일한 미세구조 를 가진 코팅층을 제조할 수 있다.
Abstract:
Un matériau réfractaire résistant à haute température en milieu oxydant contient au moins : - un premier constituant correspondant à de l'hafnium, ou un composé non oxyde de l'hafnium ou correspondant à un mélange d'au moins deux métaux et/ou cmoposés choisis parmi l'hafnium, um composé non oxyde de l'hafnium, - un deuxième constituant correspondant à du bore ou un composé non oxyde du bore, ou correspondant à un mélange de bore et d'un composé non oxyde du bore, - un troisième constituant correspondant à une terre rare RE ou un composé non oxyde de la terre rare RE, ou correspondant à un mélange de terre rare RE et d'un composé non oxyde de la terre rare RE, où RE est choisi parmi le scandium, 1 yttrium et les lanthanides. Le matériau ne contient pas de silicium ni de composé du silicium.
Abstract:
The inorganic membrane consists of a macroporous inorganic support and an inorganic membrane layer. The membrane layer is formed through depositing an inorganic layer by "Chemical Vapour Deposition" or "sputtering" on the macroporous support, onto this inorganic layer a photo-lacquer layer is formed, this photo-lacquer layer being exposed to a regular mask pattern with the use of a suitable source, this lacquer layer being developed, and in the inorganic layer the mask pattern is etched by a suitable etchant, thus forming the membrane layer. The pattern of the membrane layer may be given any particularly design, practically with a repetition rate in the range 0.1-10 mu m. It is thus conceivable to separate not only particles according to their size, but also to their shape. The membrane layer can be deposited very thinly in comparison to the dimension of the pore size, enabling a large flux, a reduced clogging and a minimal damage to particles or cells.
Abstract:
Synthetic ceramic proppants are described. Proppants having a monodispersity of 3-sigma distribution or lower are also described, including methods to make these proppants and methods of using these proppants.
Abstract:
Disclosed herein is a method comprising disposing a first particle in a reactor; the first particle being a magnetic particle or a particle that can be influenced by a magnetic field, an electric field or a combination of an electrical field and a magnetic field; fluidizing the first particle in the reactor; applying a uniform magnetic field, a uniform electrical field or a combination of a uniform magnetic field and a uniform electrical field to the reactor; elevating the temperature of the reactor; and fusing the first particles to form a monolithic solid.
Abstract:
A porous ceramic matrix contains a plurality of ceramic particles adhered to each other, and a plurality of channels defined by surfaces of neighbouring ceramic particles, the channels each having an average diameter of 0.5-2.5 μm. Preferred ceramics also have a porosity of 25.0-40.0%, a Darcy's Permeability of 1.57-34.8 x 10 -14 m 2 , and a mechanical strength of 25-64 MPa. Also disclosed is a method of preparing such a porous ceramic matrix, comprising providing a pellet containing ceramic particles that are coated with a monomer, a catalyst, and a binder; polymerising the monomer in the solid state by heating, then carbonizing and sintering the pellet.