WO1998048431A1 - Resistors formed of aluminum-titanium alloys - Google Patents
Resistors formed of aluminum-titanium alloys Download PDFInfo
- Publication number
- WO1998048431A1 WO1998048431A1 PCT/US1998/007794 US9807794W WO9848431A1 WO 1998048431 A1 WO1998048431 A1 WO 1998048431A1 US 9807794 W US9807794 W US 9807794W WO 9848431 A1 WO9848431 A1 WO 9848431A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mol percent
- resistor
- aluminum
- additional metal
- resistors
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
Definitions
- the present invention relates to resistors adapted for use in electrical circuits and formed of aluminum-titanium alloys.
- Heavy duty power resistors are commonly employed in electrical circuits to control electrical current flow by converting electrical energy to heat, which may then be dissipated into the surrounding environment. Normally, resistors rated at 300
- power resistors typically have been made from nickel-chromium alloys (NiChromes), copper-nickel alloys (Cu-Ni) or stainless steel alloys, with FeCrAl, 304 and 430 being the most common stainless steel types.
- Stainless steel is often modified with additional metals to improve its electrical characteristics, for example, resistivity and changes in resistivity levels over an operating temperature range. While all of these materials may be used in high temperature applications, i.e. up to about 1000°C, they all have one or more shortcomings which compromise their use.
- the nickel-chromium alloys commonly referred to NiChrome materials are expensive and heavy, both of which factors limit their use in a wide range of applications.
- the copper-nickel alloys are expensive and exhibit relatively low working temperatures and melting points.
- the copper-nickel alloys are disadvantageous in that they are not readily available in sheet form.
- the stainless steel alloys also exhibit a relatively low resistivity and typically the resistivities of these alloys vary substantially over a temperature range, thereby rendering the alloys unsuitable for applications requiring precise resistivity
- the type 430 stainless steel which is commonly employed is slightly magnetic and therefore unsuitable for low inductance applications.
- Various modified forms of stainless steel are also slightly magnetic and therefore unsuitable for low inductance applications.
- These modified stainless steel alloys are also typically more expensive and therefore not attractive for widespread use.
- the resistors are formed of an alloy comprising from about 50 to 95 mol percent aluminum, from about 5 to about
- the resistors according to the present invention are strong, lightweight and non-magnetic. Additionally, the resistors according to the present invention exhibit nearly constant resistivity over a wide operating temperature range. The alloys from which the resistors are formed exhibit a good combination of ductility, material density and melting point to allow
- the Figure sets forth resistivity measurements for various resistors according to the present invention over a temperature range of from about 25 °C to 600°C, as described in further detail herein.
- the resistors according to the present invention are adapted for use in an electrical circuit and may be formed of any conventional resistor structure. As known in the art, resistors are employed to control current flow in an electrical circuit. Preferably, the resistor will include connectors for facilitating connection of the resistor into an electrical circuit in a conventional manner.
- the resistors of the present invention are suitable for use in a variety of applications, including heavy duty environments requiring resistors rated at 10 watts and above.
- the resistors according to the present invention are formed of an alloy which comprises from about 50 to about 95 mol percent aluminum, from about 5 to about 50 mol percent titanium and up to about 15 mol percent of at least one additional metal
- aluminum-titanium alloys from which the present resistors are formed provide lightweight yet strong resistors. Additionally, the combination of ductility, resistivity, density and melting point exhibited by these alloys facilitates formation of the alloys into resistors of desired shapes and sizes, particularly when the alloys comprise at least one additional metal or a combination of additional metals in an amount up to about 15 mol percent. Additionally, the alloys from which the present resistors are formed exhibit good corrosion resistance without disadvantageous ⁇ effecting the resistivity properties.
- the resistors according to the present invention are
- the resistors according to the present invention are formed from an alloy comprising from about 65 to about 70 mol percent aluminum, from about 20 to about 30 mol percent titanium and from about 5 to about 10 mol percent of at least one additional metal.
- the at least one additional metal comprises one or more transition metals of groups IB-VIIB or group VIII, although other metals, for example, boron, may be employed, alone or in combination with one or more transition metals.
- the additional metal is selected from the group consisting of copper, manganese, iron,
- the alloys chromium, vanadium, nickel, boron, and mixtures thereof.
- the alloys chromium, vanadium, nickel, boron, and mixtures thereof.
- the alloys from which the resistors of the present invention are formed may themselves be formed in accordance with conventional metal alloying techniques.
- the alloys may be formed to resistors in accordance with techniques known in the art and particularly processing such as annealing, pressing, cutting, drilling and the like are facilitated with the alloys according to the present invention, particularly wherein at least one additional metal is included in the aluminum-titanium
- Example 1 various aluminum-titanium alloys are formed and subjected to measurement of Vickers hardness according to ASTM-E92 using a load of 200 gf.
- the approximate molar composition and hardness of each alloy is set forth in Table 1.
- the hardness value for each allow is presented as an average of six measured values.
- the alloys were formed as resistors, inserted into an electrical circuit and subjected to measurement of resistivity over a temperature range of from ambient to about 600°C according to the four probe technique known in the art.
- the area and length of each resistor sample subjected to measurement is set forth in Table 2, and the results of the resistivity measurements are set forth in the Figure.
- the Figure also provides
- resistors according to the present invention generally exhibit consistent resistivity over wide temperature ranges and at a variety of levels, thereby demonstrating that the resistors according to the present invention are suitable for use in a variety of applications, including precision
- the resistivities according to the invention vary by not more than about 50%, more preferably by not more than about 30%, and even more preferably by not more than about 10%), over a temperature range of from about 25°C to about 600°C. Additionally, the non-magnetic, lightweight, corrosion resistance and strength characteristics of the resistors according to the present invention contribute to their
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Non-Adjustable Resistors (AREA)
- Conductive Materials (AREA)
- Apparatuses And Processes For Manufacturing Resistors (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU74672/98A AU7467298A (en) | 1997-04-18 | 1998-04-17 | Resistors formed of aluminum-titanium alloys |
EP98922040A EP0976135A1 (en) | 1997-04-18 | 1998-04-17 | Resistors formed of aluminum-titanium alloys |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US4463097P | 1997-04-18 | 1997-04-18 | |
US60/044,630 | 1997-04-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998048431A1 true WO1998048431A1 (en) | 1998-10-29 |
Family
ID=21933429
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/007794 WO1998048431A1 (en) | 1997-04-18 | 1998-04-17 | Resistors formed of aluminum-titanium alloys |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0976135A1 (en) |
AU (1) | AU7467298A (en) |
WO (1) | WO1998048431A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2458597A1 (en) * | 1979-06-13 | 1981-01-02 | Fusani Giovanni | Cast iron contg. aluminium and opt. nodular graphite - for mfg. electrical resistors withstanding high temps. and with low temp. coefft. of resistance |
EP0088599A2 (en) * | 1982-03-08 | 1983-09-14 | Tsuyoshi Masumoto | Ni-Cr type alloy material |
US4851192A (en) * | 1982-12-12 | 1989-07-25 | Sumitomo Light Metal Industries, Ltd. | Aluminum alloy for structures with high electrical resistivity |
EP0339676A1 (en) * | 1988-04-28 | 1989-11-02 | Tsuyoshi Masumoto | High strength, heat resistant aluminum-based alloys |
US5157373A (en) * | 1991-03-08 | 1992-10-20 | Post Glover Resistors, Inc. | Post glover resistor |
EP0530560A1 (en) * | 1991-09-05 | 1993-03-10 | Ykk Corporation | Process for producing high strength aluminium-based alloy powder |
-
1998
- 1998-04-17 WO PCT/US1998/007794 patent/WO1998048431A1/en not_active Application Discontinuation
- 1998-04-17 EP EP98922040A patent/EP0976135A1/en not_active Withdrawn
- 1998-04-17 AU AU74672/98A patent/AU7467298A/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2458597A1 (en) * | 1979-06-13 | 1981-01-02 | Fusani Giovanni | Cast iron contg. aluminium and opt. nodular graphite - for mfg. electrical resistors withstanding high temps. and with low temp. coefft. of resistance |
EP0088599A2 (en) * | 1982-03-08 | 1983-09-14 | Tsuyoshi Masumoto | Ni-Cr type alloy material |
US4851192A (en) * | 1982-12-12 | 1989-07-25 | Sumitomo Light Metal Industries, Ltd. | Aluminum alloy for structures with high electrical resistivity |
EP0339676A1 (en) * | 1988-04-28 | 1989-11-02 | Tsuyoshi Masumoto | High strength, heat resistant aluminum-based alloys |
US5157373A (en) * | 1991-03-08 | 1992-10-20 | Post Glover Resistors, Inc. | Post glover resistor |
EP0530560A1 (en) * | 1991-09-05 | 1993-03-10 | Ykk Corporation | Process for producing high strength aluminium-based alloy powder |
Also Published As
Publication number | Publication date |
---|---|
EP0976135A1 (en) | 2000-02-02 |
AU7467298A (en) | 1998-11-13 |
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