摘要:
Certain aspects of the invention provides a transient liquid phase (TLP) bonding structure, including Ni based alloys and a TLP bonded layer formed by pack cementation on the Ni based alloys using a pack composition. In one embodiment, the pack composition includes 57 wt. % of aluminum oxide powder, 30 wt. % of Ti powder, 10 wt. % of Ni-50 wt. % Al alloy powder and 3 wt. % of ammonium chloride powder. The Ni based alloys may be Ni-20 wt. % Cr alloys. In certain embodiments, pack cementation is performed on the Ni based alloys under argon for an hour using the pack composition to form a coating. Then the structure is sonicated in acetone for 2 hours, and then annealed under vacuum at about 1200° C. for 2 days to form the TLP bonding structure, which has a uniform γ′ phase distribution with identical compositions and properties at its bonding regions.
摘要:
A chain element (2), in particular a chain pin (4), for joining at least two chain links (3), characterized in that it comprises a surface layer (5) containing boron and vanadium, formed by at least one step of diffusing boron and vanadium in the areas of the chain element (2) which are close to the surface. The surface layer (5) containing boron and vanadium is formed by boriding and subsequently vanadizing a substrate material having a carbon content of 0.60 wt.-% to 1.0 wt.-%.
摘要:
A method for producing a trivalent chromium based coating on a metal substrate, a layer of nickel phosphorus alloy is deposited on a metal substrate and a trivalent chromium layer is electroplated on the Ni—P layer. The coated metal substrate is subjected to one or more heat treatments to harden the coating and to produce multiphase layers including at least one layer containing crystalline Ni and crystalline Ni3P, and at least one layer containing crystalline Cr and crystalline CrNi. By using this method it is possible to produce coatings having a Vickers microhardness value higher than 2000 HV.
摘要:
A centralizer for a tubular body in a wellbore is provided herein. The centralizer includes an elongated body having a bore there through. The bore is dimensioned to receive a tubular body. The elongated body has an inner surface and an outer surface. The centralizer also has a coating deposited on at least the inner surface. The coating is designed to provide a reduced coefficient of friction on the surface. A method of fabricating a centralizer is also provided herein.
摘要:
A system for coating a surface comprising providing a source of amorphous metal that contains more than 11 elements and applying the amorphous metal that contains more than 11 elements to the surface by a spray. Also a coating comprising a composite material made of amorphous metal that contains more than 11 elements. An apparatus for producing a corrosion-resistant amorphous-metal coating on a structure comprises a deposition chamber, a deposition source in the deposition chamber that produces a deposition spray, the deposition source containing a composite material made of amorphous metal that contains more than 11 elements, and a system that directs the deposition spray onto the structure.
摘要:
A system for coating a surface comprising providing a source of amorphous metal that contains more than 11 elements and applying the amorphous metal that contains more than 11 elements to the surface by a spray. Also a coating comprising a composite material made of amorphous metal that contains more than 11 elements. An apparatus for producing a corrosion-resistant amorphous-metal coating on a structure comprises a deposition chamber, a deposition source in the deposition chamber that produces a deposition spray, the deposition source containing a composite material made of amorphous metal that contains more than 11 elements, and a system that directs the deposition spray onto the structure
摘要:
A MoSi2nullSi3N4 composite coating which is coated on a surface of base materials which are molybden, molybden alloy, molybden-coated niobium or molybden-coated niobium alloy and a manufacturing method thereof. The MoSi2nullSi3N4 composite coating on the surface of the base material can be formed by forming a Mo2N diffusion layer by vapor-depositing of nitrogen on the surface of the base material and forming a MoSi2nullSi3N4 composite coating by vapor-depositing of silicon on the surface of the Mo2N diffusion layer, or the MoSi2nullSi3N4 composite coating on the surface of the base material can be formed by forming a MoSi2 diffusion layer by vapor-depositing of silicon on a surface of a base material by the CVD method, transforming the MoSi2 diffusion layer into a Mo5Si3 diffusion layer by heating under a high-purity hydrogen or argon atmosphere, forming a Mo2NnullSi3N4 composite diffusion layer by vapor-depositing of nitrogen on the surface of the Mo5Si3 diffusion layer by the CVD method and forming a MoSi2nullSi3N4 composite coating by vapor-depositing of silicon on the surface of the Mo2NnullSi3N4 composite diffusion layer. The MoSi2nullSi3N4 composite coating manufactured by the above method is characterized as a structure in which Si3N4 particles are distributed in a MoSi2 grain boundary of equiaxed grains, thus to improve cyclic oxidation resistance of the base material, improve low-temperature oxidation resistance, and improve mechanical properties of the coating. Therefore, transmission of fine cracks by the thermal stress can be restrained.
摘要翻译:MoSi2-Si3N4复合涂层及其制造方法,该涂层涂覆在作为钼,钼合金,钼涂层的铌或钼涂覆的铌合金的基材的表面上。 可以通过在基材表面上气相沉积氮形成Mo2N扩散层并通过在硅上气相沉积形成MoSi2-Si3N4复合涂层来形成基体材料表面上的MoSi2-Si3N4复合涂层 Mo2N扩散层的表面或基体材料表面的MoSi2-Si3N4复合涂层可以通过CVD法在基材表面上气相沉积硅形成MoSi 2扩散层而形成, 通过在高纯度氢或氩气氛下加热,将MoSi 2扩散层进入Mo5Si3扩散层,通过CVD法在Mo 5 Si 3扩散层的表面上气相沉积形成Mo2N-Si3N4复合扩散层,形成 MoSi2-Si3N4复合涂层,通过在Mo2N-Si3N4复合扩散层的表面上气相沉积硅。 通过上述方法制造的MoSi 2 -Si 3 N 4复合涂层的特征在于其中Si 3 N 4颗粒分布在等轴晶粒的MoSi 2晶界中的结构,从而提高基材的循环抗氧化性,改善低温抗氧化性,以及 改善涂层的机械性能。 因此,可以抑制由热应力引起的细裂纹的传递。
摘要:
A thermal barrier coating system and a method for forming the coating system on a component designed for use in a hostile thermal environment, such as superalloy turbine, combustor and augmentor components of a gas turbine engine. The coating system includes a diffusion aluminide bond coat whose oxide growth rate is significantly reduced to improve the spallation resistance of a thermal barrier layer by forming the bond coat to include a dispersion of aluminum, chromium, nickel, cobalt and/or platinum group metal oxides. The oxides preferably constitute about 5 to about 20 volume percent of the bond coat. A preferred method of forming the bond coat is to initiate a diffusion aluminizing process in the absence of oxygen to deposit a base layer of diffusion aluminide, and then intermittently introduce an oxygen-containing gas into the diffusion aluminizing process to form within the bond coat the desired dispersion of oxides. Thereafter, a ceramic layer is deposited on the bond coat to form a thermal barrier coating.
摘要:
The composition comprises a carbide-forming element, a carbon-containing pound selected from the class of hydrocarbons, having a boiling or sublimation point of 180.degree. to 750.degree.0 C., staying in a solid state at room temperature, an activator and an inert filler, mass %:______________________________________ carbide-forming element 40-70 carbon-containing compound 0.5-2.5 activator 0.2-5.0 inert filler the balance ______________________________________ It is recommended that the function of the carbon-containing compound be performed by diphenyl, naphthalene, anthracene, the function of activator, by halogen-containing ammonium salts, and the function of inert filler, by aluminum oxide, magnesium oxide or silicone dioxide.
摘要:
A method is proposed to attenuate hydrogen diffusion through fusion reactor components via controlled oxidation of prealloyed surfaces. Alloys of zirconium, vanadium, titanium, niobium, tantalum, tungsten, nickel and iron may be protected from hydrogen isotope permeation by using vanadium as an intermediate layer and either chromium, nickel-chromium, silicon or aluminum as the oxide forming component. This method may also be used to prevent hydrogen embrittlement of metals from external hydrogen environments and is applicable to the majority of alloy systems exhibiting hydrogen embrittlement phenomena.