The sintering mechanisms for conventional materials can be categorized into two types: solid-state sintering and liquid-phase sintering. For ceramic materials and many high-temperature metals, they are usually sintered by solid-state sintering, which is a technique for increasing the strength of objects formed from powder materials by fusing particles together at …
In the context of the patent US4863538A, sintering a part refers to the process of producing a part by scanning the aim of a directed energy beam over the target surface and sintering a layer of the powder portion corresponding to a cross-sectional region of the part when the aim of the beam is within the defined boundaries of that region.
Laser sintering is a method and apparatus for selectively sintering a layer of powder to produce a part comprising a plurality of sintered layers. The apparatus includes a computer controlling a laser to direct the laser energy onto the powder to produce a sintered mass.
The FAST acronym is widely used in the research and industrial communities. In this work we attribute to FAST a large class of sintering processes of which ECAS is a subclass. The ‘Field’ term in FAST acronym can be then referred to virtually any field such as mechanical, electric, gravitational or electromagnetic.
Most of ECAS patents employ specific sintering atmospheres, i.e.vacuum, inert gas, air, although the atmosphere may significantly affect the final properties of the sintered products. Sintering can be operated under an oxidizing, inert or reducing atmosphere and even in liquid media.
His patent [ 127] included the example of sintering Ni powder. Specifically,2.2 g of powder was placed in a die (15 mm diameter) and discharged by the superimposition of both a direct current of 760 A (9 V) and a pulsed current of 600 A (2 kHz) for about 3 s.
In 1968,Parker [ 88] patented a sintering method employing high energy short current pulses (i.e. a single pulse of at least 150 kA cm −3 for more than 1 ms) and pressure was applied by a pressure transformer device [ 89 ]. The latter transformed the electric current into a mechanical pressure.
The sintering mechanisms for conventional materials can be categorized into two types: solid-state sintering and liquid-phase sintering. For ceramic materials and many high-temperature metals, they are usually sintered by solid-state sintering, which is a technique for increasing the strength of objects formed from powder materials by fusing particles together at …
Abstract: This research provided the latest development of sintered silver (Ag) and copper (Cu) as die-attach materials based on the patent data retrieved from using the two …
The all Cu-In intermetallic compound formed by micro-particle copper and indium has a high melting point, which can meet the high service temperature requirements of the sintered body …
130 a 2D section of a part [16]. The two main regions affecting residual stress are; top layer that is exposed to the laser and interface between the top layer and previous layer (Fig.5).
requirements. The complete metallization process of a solar cell includes a series of heating steps in furnace, needed for evaporate the paste solvents (curing), melting the metal particles (sintering) and etching the anti-reflective coating and electrically contacting the paste and the substrate (firing) (Luque and Hegedus 2003). These
(a) Dependence of crystallite size on SPS with temperature and applied pressure for two different commercial powders of alumina (TM-alumina and AA-alumina) (from [26]).
In 1968, Parker [Citation 88] patented a sintering method employing high energy short current pulses (i.e. a single pulse of at least 150 kA cm −3 for more than 1 ms) …
Solid-state ceramics, such as lithium-stuffed garnet materials and lithium borohydrides, oxides, sulfides, oxyhalides, and halides have several advantages as materials …
It has been disclosed that silver sinter joints can be formed on bare copper surfaces without applying mechanical pressure during a sintering process using a sinter paste …
[0004] US Patent No. 4913982, incorporated herein by reference, describes a method for making a solid oxide ceramic fuel cell whereby the individual components of the fuel cell are stacked …
Systems and methods for sintering and conditioning fuel cell stacks utilizing channel guides, baffles, and internal compression systems are provided. Sintering and conditioning may be performed utilizing a fuel cell column cartridge assembly and fuel cell stacks may be sintered and conditioned at the system level during the same annealing cycle on the same support.
In 1968, Parker [Citation 88] patented a sintering method employing high energy short current pulses (i.e. a single pulse of at least 150 kA cm −3 for more than 1 ms) and pressure was applied by a pressure transformer device [Citation 89]. The latter transformed the electric current into a mechanical pressure. Pure iron powder was ...
[0004] US Patent No. 4913982, incorporated herein by reference, describes a method for making a solid oxide ceramic fuel cell whereby the individual components of the fuel cell are stacked before cutting and sintering. Four tape layers consisting of cathode, electrolyte, anode and interconnect are assembled together to form a multilayer tape.
The invention relates to an ultra-fast sintering method and a sintering system for preparing nano-ceramics by ultrasonic-assisted pressurization and high-frequency induction, and belongs to the technical field of nano-ceramics sintering.
A method and apparatus for selectively sintering a layer of powder to produce a part comprising a plurality of sintered layers. The apparatus includes a computer controlling a laser to direct...
early 2000s. At the same time, many patents for the earlier versions of 3D printing techniques expired, and many companies started to make their brands of 3D printers, making 3D printers accessible to the general public. After 2010, wide-spread access to 3D printing techniques has led to advanced printing techniques with enhanced accuracy, precision, and speed. In the early …
Solid-state ceramics, such as lithium-stuffed garnet materials and lithium borohydrides, oxides, sulfides, oxyhalides, and halides have several advantages as materials for ion-conducting electrolyte membranes and separators in a variety of electrochemical devices including fuel cells and rechargeable batteries. When compared to ...
It has been disclosed that silver sinter joints can be formed on bare copper surfaces without applying mechanical pressure during a sintering process using a sinter paste based on silver nanoparticles or based on a mixture of silver microparticles (typically in the range of 1 to 10 μm in size) and silver nanoparticles (typically in ...
A method of fabricating a fully dense, three dimensional object by direct laser sintering is disclosed. In a chamber with a partial pressure atmosphere, a beam of directed energy melts metallic powder in order to form a solid layer cross section. Another layer of powder is deposited and melted, along with a portion of the previous layer.
In order for each component to be sintered correctly, it must be pressed with a force proportional to its projection surface and subjected to a predetermined temperature, for a predetermined...
The all Cu-In intermetallic compound formed by micro-particle copper and indium has a high melting point, which can meet the high service temperature requirements of the sintered body bonding...
This article introduces an advanced hybrid silver sintering material, which incorporates highperformance silver sintering with high reliability and process-friendly of epoxy-based die-attaching ...
The invention relates to an ultra-fast sintering method and a sintering system for preparing nano-ceramics by ultrasonic-assisted pressurization and high-frequency induction, …
Abstract: This research provided the latest development of sintered silver (Ag) and copper (Cu) as die-attach materials based on the patent data retrieved from using the two criteria of patent claims of "silver" or "copper", "sinter*" and cooperative patent classification (CPC) of H01L2224/8384 (die-attach application ...
Durability is a crucial metric for proton exchange membrane fuel cells to achieve large-scale commercialization. It can be effectively improved from durable active site, support, and electrode structure design. In this review, Xiao and Shao summarize the principles and feasible strategies that can provide guidance for the development of durable electrochemical devices.
The invention discloses a sintering method of a solid oxide fuel cell, which comprises the following steps of 1), coating an electrolyte layer on a flat anode support, drying, preforming and...
A silver sintering preparation comprising: (A) 30 to 88 wt.-% of silver flake particles having a mean particle diameter (d50) in the range of >1 to 20 μm, (B) 5 to 30 wt.-% of at least one silver precursor, (C) 1 to 10 wt.-% of an organic polymer system, and (D) 6 to 30 wt.-% of organic solvent, wherein the organic polymer system (C) is chemically essentially stable at …
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