摘要:
A silicon carbide-natured refractory block includes a fire-resistant block body, and a calcination coated layer. The fire-resistant block body includes a silicon carbide-natured refractory having a predetermined configuration. The calcination coated layer includes silicon oxide made by heating an outer superficial portion of the fire-resistant block body to oxidize at least some of silicon carbide therein to turn the silicon carbide into the silicon oxide. The silicon oxide sinters the calcination coated layer to increase the corrosion resistance.
摘要:
A laminated ceramic matrix composite structure is strengthened with one or more layers of a metal reinforcement. The metal reinforcement is selected to provide optimal strength and thermal compatibility with the ceramic matrix composite. The metal reinforcement includes an outer oxidized layer that bonds to the ceramic matrix composite. It may also include a barrier layer on the surface of the metal that helps prevent further oxidation. The structure is formed using standard composite prepreg layup techniques.
摘要:
A ceramic/metal composite structure includes an aluminum oxide substrate, an interface bonding layer and a copper sheet. The interface bonding layer is disposed on the aluminum oxide substrate. The copper sheet is disposed on the interface bonding layer. The interface bonding layer bonds the aluminum oxide substrate to the copper sheet. Some pores are formed near or in the interface bonding layer. A porosity of the interface bonding layer is substantially smaller than or equal to 25%. A method of manufacturing the ceramic/metal composite structure is also provided.
摘要:
Surface metallization technology for ceramic substrates is disclosed herein. It makes use of a known phenomenon that many metal-metal oxide alloys in liquid state readily wet an oxide ceramic surface and strongly bond to it upon solidification. To achieve high adhesion strength of a metallization to ceramic, a discrete metallization layer consisting of metal droplets bonded to ceramic surface using metal-metal oxide bonding process is produced first. Next, a continuous metal layer is deposited on top of the discrete layer and bonded to it using a sintering process. As a result a strongly adhering, glass-free metallization layer directly bonded to ceramic surface is produced. In particular, the process can be successfully used to metallize aluminum nitride ceramic with high thermal and electrical conductivity copper metal.
摘要:
A metal layer is bonded to a ceramic substrate in a method, wherein a first metal layer (e.g., a copper film) is first applied to a surface of the ceramic substrate. The ceramic substrate, with the first metal layer applied thereto, is then heated in an atmosphere including oxygen (e.g., to a temperature below the eutectic temperature of the metal oxide) to form an adhesion-promotion layer. A second metal layer (e.g., a copper foil) is then bonded to the adhesion-promotion layer. Where the metal is copper, the adhesion promotion layer can include copper oxide and copper aluminum oxide.
摘要:
In a process for the manufacture of metal-ceramic compound material, especially metal-ceramic substrates, bonding compounds in the form of a plate-shaped ceramic substrate and an oxidized metal foil are bonded together by means of heating to a processing temperature in a protective gas atmosphere. For this purpose, the bonding components are placed in a reaction space formed within a capsule, which (space) is separated from the outer protective gas atmosphere by the capsule or in connection with the outer protective gas atmosphere only by means of a small opening.
摘要:
A metal-ceramic joined article comprises a ceramic member, a thin metal layer joined onto the surface of the ceramic member and a surface layer, formed on the surface of the thin metal layer, having the function to prevent carbon and/or nitrogen diffusing into the thin metal layer. The thin metal layer contains a first oxide film forming element capable of forming a first oxide film having the function to suppress carbon and/or nitrogen from diffusing into the thin metal layer, and the surface layer preferably comprises the first oxide film formed by oxidizing the surface of the thin metal layer before joining.
摘要:
A method of bonding a sheet of metal such as copper on a substrate of aluminum nitride, the method comprising the following steps known per se: i) growing a layer of alumina on the aluminum nitride substrate by means of heat treatment; and ii) placing the sheet of metal on the alumina layer and then bonding them together; the method being wherein alumina-growing step i) is performed under a controlled oxidizing atmosphere which is free from moisture.
摘要:
A laminated body comprising a ceramic member and a metal member, and a method of forming the laminated body are described. The laminated body is characterized in that the ceramic member contains in its surface portion a bonding agent and the metal member is directly bonded to the surface of the ceramic member. The method of forming the laminated body is characterized in that a bonding agent-containing layer is first formed in the surface of the ceramic member and then the bonding agent-containing layer is heated while being contacted with the metal member.
摘要:
Disclosed is a method of bonding metals to substrates such as ceramics or metals. A bonding agent forms a eutectic alloy with the metal to provide bonding. Several methods of supplying the bonding agent to the system are disclosed. However, regardless of which method of introducing the bonding agent into the system is employed, the quantity of the bonding agent is carefully controlled so that the compound in the region of the bond is hypoeutectic. To form the bond, the metal and the substrate are placed adjacent each other and the bonding agent is introduced into the system. The system is then heated to a temperature between the eutectic temperature and the melting point of the metal for a preselected time. The system is then cooled to form a bond. The heating is carried out in an inert atmosphere or a vacuum.