Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
  • B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray casting
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C1/00—Making non-ferrous alloys
  • C22C1/04—Making non-ferrous alloys by powder metallurgy
  • C22C1/0425—Copper-based alloys
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C9/00—Alloys based on copper
  • C22C9/02—Alloys based on copper with tin as the next major constituent

Definitions

• the invention relates to a Cu-Sn-Ti alloy, its production and its Use.
• the CuSnTi alloy consists of Sn 12-20% by weight, Ti 0.002-1.0 % By weight of rest Cu and usual impurities.
• Such an alloy can sufficiently quick cooling from the molten state Room temperature can be obtained in such a structural state that that for the Semi-finished product preform (casting tape, casting block, casting bolt) is technically free from coarse, brittle phases and therefore in a special way for the Manufacture of semi-finished products as strips, profiles, wires, hollow profiles or tubes by kneading is suitable.
• Such semi-finished products are ideal for Production of various everyday objects and items Functional parts of precision mechanics and electromechanics as well as general ones Mechanical engineering. Because of their chemical composition and the Such an alloy has a particularly favorable method of manufacture Combination of high mechanical strength with excellent ductility combined with good corrosion resistance.
• the object is achieved by a Cu-Sn-Ti alloy, which consists of the molten state is cooled down so quickly that the castings
• the usual segregation does not occur and that the structure is free of is macroscopic segregation.
• macroscopic segregations understood structural components that are present in the cast structure and one Take a share of more than 10 vol .-% and one as individual phase fields Have dimensions of more than 1 mm.
• a sufficiently high one Cooling rate between liquidus and solidus temperature to avoid Such macro-increases can be achieved by various techniques.
• the use of classic cast alloys is prohibited for the Hot forming due to the melting at the process temperature Phases of segregation, which lead to the destruction of the workpiece or because of low process temperature then brittle phases that either the Drive the forming resistance so high that the forming is done mechanically is no longer possible or lead to shearing and destruction of the workpiece.
• the preforms produced according to the invention allow their use of hot forming processes with a large change in cross-section. Are there Processes with dominant compressive stress such as presses and round rolls highly recommended.
• alloy compositions of the type of this type provided technically as a preform, they are suitable for kneading in the Heat from rolling, pressing and forging and from these basic shapes derived forming process.
• they can be warm beforehand formed castings, but also the castings themselves, by rolling, drawing, Hammering, embossing, deep drawing and forming processes derived from such as Pilgrims, flanging, knurling and bending are formed
• Preforms according to 1.1 are preferably without a hot forming step processed further.
• Preforms according to 1.1 is expediently used faster and larger cross-section reduction a hot forming stage intended.
• the sequence of cold working and intermediate annealing according to 2.2 and 2.3 serves the manufacture of the desired semi-finished products and their dimensions and can be used for Repeat as needed.
• the cold forming and final treatments serve the manufacture of semi-finished products, the targeted setting of geometric and mechanical Properties for the direct use of the semi-finished product or its further processing e.g. by coating, plating or manufacturing composite materials.
• the range of cast bronze designed for use by the present invention Representing a worthwhile range ranges from about 12 to 20% by weight of Sn.
• Iron at levels of is also used to support the homogeneous structure formation 0.005 to 2% by weight, but it also contributes through the formation of a connection Sn and in interaction with aluminum, titanium, zirconium and phosphorus thermal stabilization of the material under thermal stress. Levels above 2% by weight are very high because of the then great risk Avoid iron lines or individual iron particles that are forming flawless surfaces. Common substitute for iron is cobalt, for the same applies.
• Levels up to 5% by weight appear to improve the Strength properties and increased corrosion resistance where necessary recommendable. Levels above 5% by weight lead to difficult handling of the material, since then the hardenability of the known Cu-Ni-Sn materials becomes permanently noticeable.
• Magnesium contents up to 1% by weight can be similar to titanium, zirconium or Phosphorous can also be used. Regarding the content restriction the considerations made for titanium and zircon apply. In addition, the Compound formation of magnesium and phosphorus and the strong tendency of Magnesium for strengthening the tempering for thermal stabilization of the Material can be used.
• Aluminum can be used advantageously up to 2% by weight for temper hardening to strengthen and / or to increase the mechanical parameters.
• the melt proves an aluminum addition to be advantageous if the viscosity must be set to a low level because Residual oxygen levels, especially when interacting with titanium and magnesium Have made the melt viscous.
• Aluminum contents higher than 2% by weight lead to impairments of later operations for surface finishing, such as for example galvanizing and also make soldering or welding difficult, and should therefore be avoided.
• Chip breaking additives of lead and / or carbon in the form of graphite with up to 3% by volume are indicated for setting the cutting properties. Continue but comes to ensure emergency running properties sliding components are of great importance. Content over 3 vol .-% lead to disadvantages in terms of plastic formability and mechanical resilience, so that they are within the scope of the presented invention be disregarded.
• Tin bronzes are very suitable for this. The higher their tin content, the higher the strengths achieved. Common kneading tin bronze included rarely more than 9% by weight and therefore appear unsatisfactory. Tin bronzes with very high levels e.g. 15% by weight are now used as kneading materials of the present invention.
• a bolt CuSn16Ti with the composition 15.5% by weight Sn, 0.25% by weight Ti, 84.15% by weight Cu (rest usual impurities) was used with a spray compacting system from Mannesmann- Demag sprayed under license from Osprey Metals.
• the composition was melted in a vacuum oven to avoid the undesirable slagging of Ti.
• the gas-metal ratio set during spraying was 0.45 Nm 3 / kg.
• the dimensions achieved were 480mm in diameter and 1200mm in length.
• the metallographic control showed a structure free of segregation with fine excretions.
• the wires had the following characteristics: Hardness: tensile strength 930 MPa, yield strength 810 MPa, elongation at break A5 18%, hardness 240HV10, elastic modulus 80 GPa. Soft: tensile strength 490 MPa, yield strength 240 MPa, elongation at break A5 62%, hardness 100HV10, grain size 40 ⁇ m.
• the hardness remains for the material according to this invention significantly higher level and the grain size is significantly smaller than for not Materials according to the invention, even when using the inventive How to use higher tin contents.
• the behavior of the material according to the invention is favorable after Process according to the invention always produced if after The highest possible strengths should be maintained and the Suitability for use due to coarse grain formation with regard to mechanical loads or questions of surface processing must not be restricted.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Manufacturing & Machinery (AREA)
• Forging (AREA)
• Conductive Materials (AREA)
• Manufacture Of Alloys Or Alloy Compounds (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=7852708

Family Applications (1)

Country Status (5)

Cited By (3)

Families Citing this family (8)

Citations (3)

Family Cites Families (12)

• 1997
  • 1997-12-19 DE DE19756815A patent/DE19756815C2/de not_active Expired - Fee Related
• 1998
  • 1998-12-04 ES ES98123159T patent/ES2196465T3/es not_active Expired - Lifetime
  • 1998-12-04 PT PT98123159T patent/PT926251E/pt unknown
  • 1998-12-04 DE DE59807730T patent/DE59807730D1/de not_active Expired - Lifetime
  • 1998-12-04 EP EP98123159A patent/EP0926251B1/fr not_active Expired - Lifetime
  • 1998-12-16 US US09/212,524 patent/US6136103A/en not_active Expired - Lifetime

Patent Citations (3)

Non-Patent Citations (6)

Also Published As

Similar Documents

Legal Events