Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
  • B32B15/017—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of aluminium or an aluminium alloy, another layer being formed of an alloy based on a non ferrous metal other than aluminium
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C14/00—Alloys based on titanium
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
  • C22F1/18—High-melting or refractory metals or alloys based thereon
  • C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon

Definitions

• the invention relates to a suitable for high temperature use titanium alloy.
• titanium materials are particularly suitable for the production of components for vehicle construction.
• the use of conventional titanium alloys in the field of the exhaust system of internal combustion engines, however, is substantially opposed by the fact that when they are heated to temperatures of more than 600 0 C there is a risk of breakage due to coarse grain formation. Coarse grain formation occurs in particular when the titanium material is exposed for a long time to a high operating temperature.
• a titanium sheet is provided by roll cladding and heat treatment with an Al cladding layer protecting the Ti sheet from oxidation.
• the Al clad layer can not prevent coarse grain formation in the Ti base material due to prolonged high-temperature heating.
• JP 2001 089821 A discloses a Ti alloy which contains (in% by weight) more than 1% and up to 5% Fe, 0.05-0.75% O and more In addition, 0.01 * e (0 ' 5 *% Fe) - 0.5 * e - contains (0 ' 5 *% Fe) % Si, where% Fe represents the respective Fe content.
• the Ti alloy thus composed is not only intended to be high-strength and easily deformable, but also to have excellent resistance to oxidation at high temperatures. In practice, however, shows that such composite Ti alloys, the operating temperatures that occur for example in the field of exhaust systems of motor vehicles, not withstand permanently.
• JP 04 105659 A discloses a Ti alloy for biological applications, in particular for the production of artificial bones, which in addition to contents of silicon should also have contents of yttrium in order to optimize the compatibility of the alloy with the body.
• a heat treatment is performed which causes a near-surface layer in which Si and Y are enriched to form.
• the problem of high temperature resistance of a Ti alloy is not addressed in this document.
• the object of the invention was to provide a titanium alloy, which has only a slight tendency to embrittlement as a result of coarse grain formation under the influence of high operating temperatures.
• one or more elements from the group of lanthanides in contents which in total amount to 0.01-2%
• a titanium alloy composed according to the present invention due to the presence of one or more rare earth elements, is selected from the group of lanthanides (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu ) a particularly good high temperature resistance.
• the lanthanides present in the Ti alloy according to the invention lead to the fact that the oxygen contained in the titanium alloy is bound and, therefore, upon heating of a titanium made of the titanium material according to the invention Sheet metal or component no longer unfavorable effect on the ductility of the material.
• lanthanide contained in the alloy according to the invention effectively suppresses grain growth even in the case of prolonged heating in high temperature ranges from 600 ° C. to 1000 ° C.
• titanium alloys according to the invention are outstandingly suitable for the production of components which, in their practical use, are exposed to high temperatures over a long period of use.
• sheets produced from a titanium alloy according to the invention can be used particularly well for producing parts for exhaust systems of powerful motor vehicles.
• Silicon additionally contributes to the grain refining in the Ti alloy according to the invention.
• the maximum Si content is limited to 0.8 wt .-%, to an excessive decrease in the ductility of the material according to the invention safe to prevent.
• Optimized influences on the properties of the alloy according to the invention are found in silicon when it is present in amounts of 0.25-0.5% by weight.
• titanium material according to the invention for additional protection against oxidation, for example, following the example of the procedure known from DE 101 03 169 A1 with an aluminum or another cover layer suitable for this purpose.
• an AI cover layer can be guaranteed optimal performance characteristics for a titanium alloy according to the invention even after prolonged use in the high temperature range of more than 800 0 C, in particular more than 950 0 C.
• lanthanide rare earth metal in a Ti alloy according to the invention are optimal when they are 0.5-1.0 wt .-%.
• lanthanides are preferably used cerium and lanthanum, either alone or in combination.
• suitable are a La and / or a Ce mischmetal.
• the Fe content is limited according to the invention to a maximum of 2% by weight, in addition to the addition of Fe To set entering solidification so that the Ti material can still deform properly even at low temperatures.
• the grain-refining action of iron occurs when the Fe content is at least 0.03% by weight. is. Optimized effects of Fe result when the Fe content is 0.03-0.3 wt%.
• the oxygen content of a Ti alloy according to the invention is limited to a maximum of 0.3 wt .-% to ensure that the oxygen content in the course of heat treatment, in the production of a composite material according to the invention after the application of the AI cover layer for cohesive connection required is not a critical upper limit with regard to the required ductility increases. Practical experiments have shown that optimum properties of a Ti alloy according to the invention and of a composite material produced using this Ti alloy according to the invention occur when the oxygen content of the Ti alloy is 0.03-0.25% by weight.
• Aluminum has a stabilizing effect on the OC phase of Ti alloys.
• the Al content of an alloy according to the invention is limited to a maximum of 1.0 wt .-%.
• the contents of these elements may be at least 0.02 wt Wt .-% amount.
• the elements belonging to the group Mo, Ta, Nb, Zr, Mn, Cr, Co, Ni, Cu, V, Si, H stabilize the ⁇ phase of Ti alloys. To take advantage of this effect, at least one of these elements should be present at levels of at least 0.03-2% by weight. The invention will be explained in more detail with reference to an embodiment.
• a titanium alloy according to the present invention containing, in addition to titanium and unavoidable impurities, 0.4% by weight of Si, 0.2% by weight of Fe and 0.6% by weight of La, is melted and made a Ti tape having a 1 Rolled 25 mm thickness.
• a composite material E has been produced by, to avoid absorption of oxygen according to the known from DE 101 03 169 Al known method, an Al film having a thickness of 0.1 mm by roll cladding as a topcoat the Ti tape used as the base layer of the composite has been applied.
• the Al overcoat layer thus deposited on the titanium base material had a thickness of 0.4 mm after roll cladding.
• a composite V was produced in the same way, the Ti base layer in addition to titanium and unavoidable impurities 0.4 wt .-% Si and 0.2 wt .-% Fe had.
• the modulus of elasticity "E” is 0.2% proof stress the tensile strength "R m " and the elongation "A” after a five minutes and after a 100 hour use at 800 0 C indicated.
• FIG. Ia is a micrograph of the composite according to the invention Ti base layer of a sample sheet of the composite material E after 5 minutes of use at 800 0 C is shown. The sample has a clearly fine-grained structure.
• FIG. 2 a shows a micrograph of the Ti base layer of a sheet metal sample of the composite material V mentioned for comparison after the 5-minute use at 800 ° C.
• FIG. 2b shows a clear contrast

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• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• Organic Chemistry (AREA)
• Metallurgy (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Crystallography & Structural Chemistry (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Catalysts (AREA)
• Exhaust Silencers (AREA)
• Hard Magnetic Materials (AREA)
• Soft Magnetic Materials (AREA)
• Materials For Medical Uses (AREA)

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• 2005
  • 2005-05-23 EP EP05011073A patent/EP1726669B1/de not_active Expired - Lifetime
  • 2005-05-23 DE DE502005010172T patent/DE502005010172D1/de not_active Expired - Lifetime
  • 2005-05-23 AT AT05011073T patent/ATE479783T1/de active
• 2006
  • 2006-05-23 JP JP2008512826A patent/JP5395428B2/ja not_active Expired - Fee Related
  • 2006-05-23 WO PCT/EP2006/062522 patent/WO2006125776A1/de not_active Ceased
  • 2006-05-23 US US11/915,065 patent/US8021605B2/en not_active Expired - Fee Related

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