Abstract:
Unique and improved chromium coatings derived from modified chromium-containing slurry formulations are disclosed. The slurry formulation includes a combination of a selected halide activator and buffer material that synergistically interact with each other to form chromium diffusion coatings with improved microstructure in comparison to chromium diffusion coatings produced from conventional chromizing processes. The coatings may be locally applied in a controlled manner with accuracy onto various parts, including those having internal sections with complex geometries, without masking any portion thereof.
Abstract:
A coating process for applying a bifurcated coating to an article is disclosed including applying an aluminizing slurry to a first portion of the article, applying a chromizing slurry to a second portion of the article, and simultaneously heat treating the article, the aluminizing slurry, and the chromizing slurry. Heat treating the aluminizing slurry forms an aluminide coating on the first portion of the article and an aluminide diffusion zone between the article and the aluminide coating. Heat treating the chromizing slurry forms a chromide coating on the second portion of the article and a chromide diffusion zone between the article and the chromide coating. The first portion and the second portion are both maintained in an unmasked state while applying the aluminizing slurry and the chromizing slurry and during the heat treating.
Abstract:
Disclosed is a method for improving the high-temperature stability of a component, in particular a blade of a turbomachine, formed at least partially from a molybdenum alloy that, besides molybdenum, silicon, boron and titanium, comprises iron and/or yttrium. The method comprises depositing a diffusion barrier layer formed from technically pure molybdenum or tungsten or being an alloy based on molybdenum and/or tungsten at least on an outer surface, which comprises the molybdenum alloy, of the component, and depositing silicon on the diffusion barrier layer to form molybdenum silicides and/or tungsten silicides.
Abstract:
Unique and improved chromizing processes are disclosed. The processes involve forming localized chromizing coatings onto selected regions of a substrate. The chromium diffusion coatings are locally applied to selected regions of substrates in a controlled manner, in comparison to conventional chromizing processes, and further in a manner that produces less material waste and does not require masking. A second coating can be selectively applied onto other regions of the substrate.
Abstract:
An apparatus for masking an article with masking material is disclosed. The apparatus generally includes a spray head connected to a primary channel which forms a passage for the masking material. This channel has two sections, the first of which terminates in a junction with the spray head and is angled from the second section. In addition, the apparatus has at least one secondary channel which forms an air passage and is attached to the primary angled channel.
Abstract:
A method and apparatus (2) for masking a portion (36) of a component (30), the apparatus (2) comprising: a sacrificial masking element (4) for masking the portion (36); and a locating jig (6) detachably connectable to the sacrificial masking element (4) and configured to position the sacrificial masking element (4) over the portion (36) of the component (30).
Abstract:
A metallic member for a mobile system of an internal combustion engine may include a body defining a crystallographic structure. The crystallographic structure may include an outer layer, a substrate and a saturated zone between the outer layer and the substrate. An external element may be dispersed at least partially through the crystallographic structure of the body. The body may be subjected to a superficial hardening treatment from infiltrating the external element into the crystallographic structure of the body via a laser beam penetrating at least one portion of an outer surface of the outer layer of the body.
Abstract:
This method is a method for manufacturing a gas turbine blade, including: producing a gas turbine blade having a cooling pass inside thereof; and partially coating an inner surface of the cooling pass with Al. The step of partially coating an inner surface of the cooling pass with Al further including: a first step of specifying a temperature range which satisfies both of oxidation resistance and fatigue strength and the temperature distribution of the inner surface of the cooling pass based on an examination result or result of a numerical analysis; a second step of setting an Al-coating-applying portion of the inner surface of the cooling pass as the temperature range specified at the first step; and a third step of applying Al coating only into the set Al-coating-applying portion.
Abstract:
A masking apparatus is provided for masking a workpiece, for example a turbine blade, to protect portions thereof from the deposition of coating material thereon during selective application of a coating material to other portions of the workpiece. The masking apparatus includes an enclosure formed of a first mask half body defining a first cavity half and a second mask half body defining a second cavity half. The first mask half body and the second mask half body mate in assembly to form a workpiece cavity it which the workpiece may be enclosed.
Abstract:
A method for adjusting the coolant consumption within actively cooled components is produced. The components include an interior with at least one duct with different regions which have different cross sections of flow. A greater increase in the wall thickness is produced in the region having the smaller cross section of flow by a first diffusion process and a lesser increase in the wall thickness is produced in the region having the larger cross section of flow by a second diffusion process which is different from the first. By using different diffusion coatings in a component, it is possible to adjust the flow of coolant through a component in a controlled way.