Zirconium oxide molds for small molybdenum investment castings

  • 26 Pages
  • 1.40 MB
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  • English
by
U.S. Dept. of the Interior, Bureau of Mines , [Avondale, Md]
Molding materials., Zirconium oxide., Precision casting., Molybdenum cast
Statementby E.D. Calvert and H.W. Leavenworth, Jr.
SeriesReport of investigations / United States Department of the Interior, Bureau of Mines ;, 8624, Report of investigations (United States. Bureau of Mines) ;, 8624.
ContributionsLeavenworth, H. W.
Classifications
LC ClassificationsTN23 .U43 no. 8624, TS243.5 .U43 no. 8624
The Physical Object
Pagination26 p. :
ID Numbers
Open LibraryOL3922822M
LC Control Number81607140

Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link) http. Investment shell mold, for use in casting of reacting and refractory metals aluminum oxide and magnesium oxide.

Metallic molybdenum and tungsten in the form of their finely divided powders are particularly well suited for use as primary face coat mold materials in the compositions of the present invention.

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Fused Zirconium Oxide Powder. Mold coatings that are relatively unreactive with titanium and titanium alloys during casting are prepared from zirconia or yttria sols, or mixtures thereof as a binder for a refractory such as zirconium oxide, yttrium oxide and mixtures by:   1.

In the manufacture of an investment shell mold to be used in casting titanium, zirconium and other reactive and refractory metals by successively dipcoating, stuccoing and drying a disposable pattern to build a mold shell, removing the pattern from the.

A refractory mold according to claim 1 wherein two or more different refractories of the casting surface consist essentially of silica, alumina and zirconium oxide. ROY C. PFAGIN. It has been found that zirconium oxide or calcium or magnesium oxide stabilized (% CaO or MgO) zirconium oxide mixed with zirconia sol as the binder and used as the first coating of an investment cast shell mold, produces an alpha case of approximately " thick using a Ti6A14V alloy poured into a mold at ° F.

Mold surfaces. of ceramic shell moulds in particular zirconium oxide Data collected from small size investment casting Slurry Behavior and Strength of Ceramic Shell Molds in Investment Casting, The Third.

steel investment castings is less in bottom filled-molds than in top-filled molds. It is also It is also noteworthy that Equation 1 is applicable in cases where the two distributions a re mutually. oxide, contains about 57% Mo and less than % S.

Description Zirconium oxide molds for small molybdenum investment castings PDF

The roasting process does not remove gangue, but this is not a problem for the vast majority of tech oxide used to manufacture molybdenum-alloy steel.

During melting, the gangue ends up in the slag. However, tech oxide must be purified chemically to use it in the manufacture of molybdenum metal.

The year was characterized by drastically reduced production of molybdenum, some evidence of increased demand toward the end of the year, and depletion of excess inventory. This set the stage for the expected increase in molybdenum consumption in Nevertheless, ample production capacity and competitive pricing by primary producers as well as byproduct producers and.

The paper presents results of studies of the effect of Mo on properties of Zr and its alloys. In a structure of binary Zr-Mo alloys and Zr-Nb-Mo alloys a strong and corrosion-resistant phase ZrMo 2 additionally appears. In Zr-Sn-Nb-Fe alloys Mo alloying leads to an increase in amount of second phase particles, reduces their dimensions and dissolves in Laves phase particles Zr(Nb, Fe) 2.

In casting alloys that are prone to the formation of dross such as single or complex oxides of one or more of the metals making up the alloy or crucible, such dross is filtered out by a ceramic filter positioned in the filler for the mold. More specifically, oxides formed in the melt are removed by a filter made up of ceramics formed from metal oxides since the oxides have a tendency to adhere.

Method for making a novel shell mold for use in directional solidification and for casting alloys containing reactive components, wherein a binder comprising a fibrous colloidal alumina in aqueous dispersion and being essentially free of silica, is employed. The resultant shell mold is particularly suitable for the casting of nickel and cobalt based alloys containing relatively reactive.

Zirconium casting services for the aerospace and defense industries. Available capabilities are die, investment, permanent and plaster mold, and sand casting using various tolerances, surface finishes, and size range.

Extrusion, stamping, sheet metal fabrication, and semi-solid and injection molding services are also available. Typical facecoat materials for the investment casting of titanium include yttrium and zirconium oxide (Saha et al., ).

The melting and casting of titanium is accomplished in a vacuum as molten titanium would react with the hydrogen, oxygen, and nitrogen in air. This report describes the development of an investment shell molding technique that can be used to make castings of molybdenum and its alloys.

The mold material is cubic zro2 with a monoclinic zro2 binder. The shell, formed by standard investment molding techniques described in the text, is prepared for molybdenum casting by firing for 6 hours.

Methods for making various metallic alloys such as nickel, cobalt and/or iron based superalloys, stainless steel alloys, titanium alloys and titanium aluminide alloys into engineering components by melting of the alloys in a vacuum or under a low partial pressure of inert gas and subsequent casting of the melt in the graphite molds under vacuum or low partial pressure of inert gas are provided.

Zirconium oxide has excellent resitance to molten metal erosion and is extremely refractory and chemically inert in most environments. Zirconium oxide refractories tend to be used in applications where temperatures are in excess of 1, degrees C, such as in continuous casting nozzles, crucibles, kiln furniture and furnace liners.

The sintering condition was also discussed for the molybdenum oxide system. With respect to the zirconium oxide system, the pyrochlore–fluorite (P–F) phase transition due to the variation of the chemical composition was discussed especially for the yNdO − (1 − y)ZrO 2 system by means of the classical molecular dynamics (MD) simulation.

Titanium alloy is one of the most difficult industrial metals for precision casting. Because titanium alloy has high chemical activity, it can chemically react with almost all refractory materials in the molten state, which reduces the quality of the melt.

Therefore, the choice of shell material is the key to the titanium alloy investment casting process. Interfacial reaction between zirconium alloy and graphite mold/yttrium oxide ceramic mold *Xie Huasheng Male, born inPh.D.

Research Fellow. His research interests mainly focus on titanium and zirconium casting technologies. E- mail: [email protected] Investment casting (also known as lost wax casting) is a precision casting methodology that can be used over the widest range of metal types.

Tuopusen manufactures castings ranging from a few grams (about oz) in weight to about kg ( lb). The minimum wall thickness are cm( in).The size can be cast under cm X(78in) cm. Molybdenum zirconium oxide | MoO5Zr-6 | CID - structure, chemical names, physical and chemical properties, classification, patents, literature, biological.

offers zirconium castings products. About 1% of these are other fabrication services, 1% are pipe fittings. A wide variety of zirconium castings options are. I claim: 1. A process for making an investment casting mold having low reactivity with reactive metals comprising mixing finely divided yttria with an acid and an inert organic solvent, to thereby form a refractory coating composition, applying said coating composition to a shaped pattern, drying and permitting the composition to set, and heating the resulting coated pattern to a sufficiently.

With regard to castings of the (high-carbon) cobalt wear alloys, these are typically made using the investment casting process or the resin shell casting process. Normally, small quantities of remelt bar or remelt ingot are taken from larger arc-melted heats of material for this purpose.

Investment cast molds, made by the lost-wax process, are. This article describes typical foundry practices used to commercially produce zirconium castings.

Details Zirconium oxide molds for small molybdenum investment castings PDF

The foundry practices are divided into two sections, namely, melting and casting. and various casting processes, such as rammed graphite casting, static and centrifugal casting, and investment casting.

It explains the evaluation and testing of. Carbides were not readily apparent in the zirconium section cast in the molybdenum-coated graphite crucible. Carbon analyses of each casting revealed an average of 3 11 ppm for the tungsten system and ppm for the molybdenum system. Carbon analysis of the rolled zirconium plate stock, which was used as charge material, was ppm.

Plates of Aluminium Silicon Magnesium alloy (A) with thicknesses of 8 mm, 10 mm and 12 mm were cast using the green sand casting and investment casting methods at pouring temperatures of o. The most common among the molybdenum alloys is the titanium-zirconium-molybdenum alloy (TZM), which is a blend of % titanium and % of zirconium, and about 90% molybdenum.

This alloy exhibits strength even at very high temperatures, making it the perfect alloy for casting zinc. This invention concerns a process for directed solidification of a melt (1) of an alloy containing a basic metal in a mould (2, 3), wherein the mould (2, 3) filled with the melt (1) is introduced into a cooling bath (4) to effect solidification of the melt (1).

A metal sheet (5) for nucleation is laid into the mould (2, 3) for directed nucleation before the mould (2, 3) is filled, so that one.Introduction.

The refractory metal Molybdenum has several alloys. Molybdenum Alloy refers to those alloys made of molybdenum and other metal elements consisting of non-ferrous alloys, the main alloy elements are nickel (Ni), copper (Cu), titanium (Ti), zirconium (Zr), hafnium (Hf), tungsten (W) and rare earth elements.

The added alloy elements not only comes from the solid solution.Zirconium has an electronegativity of on the Pauling scale. Of the elements within d-block, zirconium has the fourth lowest electronegativity after yttrium, lutetium, and hafnium.

The zirconium-containing mineral zircon, or its variations (jargoon, hyacinth, jacinth, ligure), were .