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Novel silver rare earth oxide alloy and preparing method thereof

A technology of rare earth oxides and oxide electrodes, applied in metal processing equipment, coatings, contacts, etc., can solve the problems of difficult control of rare earth oxide powder particle size, cumbersome preparation process, and grain growth, and achieve hardening The effect is obvious, the process is simple, and the effect of high hardness

Inactive Publication Date: 2016-06-22
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN103233136 "The process of preparing silver rare earth oxide electrical contact materials for low-voltage electrical appliances by liquid phase method" is to combine the chemical reduction method and the homogeneous precipitation method to prepare nano silver and rare earth oxide powder. The method is simple in process and easy for industrial production, but It is difficult to control the particle size of rare earth oxide powder prepared by homogeneous precipitation method
CN102683051 "A Silver Rare Earth Oxide Contact Material for Low-Voltage Switching Appliances and Its Preparation Method" uses a sol-gel method to prepare silver rare earth oxide contact materials for low-voltage switching appliances. The various oxide particles prepared are fine, and evenly distributed, but the preparation process is cumbersome
CN1019841115 "A method for preparing silver rare earth oxide electrical contact material" is to prepare composite materials by spraying co-deposition method, and then carry out in-situ chemical treatment on the composite materials. The in-situ chemical reaction treatment may cause grain growth, which will affect the subsequent The processing has a certain impact and needs to be improved

Method used

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  • Novel silver rare earth oxide alloy and preparing method thereof
  • Novel silver rare earth oxide alloy and preparing method thereof
  • Novel silver rare earth oxide alloy and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Take by weighing respectively 20 g of yttrium oxide and lanthanum oxide with a particle size of 3-5 μm, and 200 g of stainless steel balls, and put them into a ball mill cylinder for ball milling for 15 hours to obtain a mixed powder of yttrium oxide and lanthanum oxide with a particle size of about 500 nm;

[0028] (2) take by weighing silver nitrate 15g, be dissolved in deionized water 500ml, be made into the silver nitrate solution that concentration is 0.2mol / L, then add the ammoniacal solution that concentration is 10-12% in the silver nitrate solution prepared, After the brown precipitate is produced, continue to add ammonia water dropwise and stir until the precipitate disappears, then add 2-4 drops of ammonia solution after the precipitate disappears, and stir evenly to obtain a silver ammonia solution; weigh 18g of ascorbic acid and add it to another container, add 500ml of deionized water to dissolve, and prepare Ascorbic acid solution.

[0029] (3) Weigh ...

Embodiment 2

[0037] The difference is that by Ag:La 2 o 3 / Y 2 o 3=85:15 (mass ratio) ratio of silver and rare earth oxide mixed powder through 22 tons of cold pressing, holding pressure for 1 hour; sintering at 650 ° C, holding for 2 hours; 40 tons of re-pressing, holding for 1 hour; 900 Refire at ℃, keep warm for 4 hours; hot extrusion at 900℃, and finally cold drawn into Φ1.36mm wire, and punched into rivets.

[0038] Alloy performance indicators:

[0039] Resistivity 2.23μΩ.cm

[0040] Tensile strength 287.6MPa

[0041] The hardness is 1058MPa

Embodiment 3

[0043] The difference is that by Ag:La 2 o 3 / Y 2 o 3 =95:5 (mass ratio) The mixed powder of silver and rare earth oxide is subjected to 18 tons of cold pressing, holding pressure for 1 hour; 550 ℃ sintering, holding for 1 hour; Refire at ℃, heat preservation for 3 hours; hot extrusion at 900℃, and finally cold drawing into Φ1.36mm wire, and rivets.

[0044] Alloy performance indicators:

[0045] Resistivity 2.42μΩ.cm

[0046] Tensile strength 399.3MPa

[0047] The hardness is 759MPa

[0048] Through the research of process parameters such as initial pressure, sintering temperature, time and recompression pressure in the preparation process of the new silver rare earth oxide composite material in Examples 1-3, the optimal process parameter of the process has been determined to be the initial pressure. 20t, sintering temperature 600°C, recompression pressure 36t, refiring temperature 900°C. The contact material provided by the invention has excellent mechanical properti...

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Abstract

The invention discloses a novel silver rare earth oxide alloy and a preparing method thereof. According to the method, a chemical reduction method and a high-energy ball milling method are combined to prepare nano silver and rare earth oxide powder, and a powder metallurgy technology is used for preparing a novel silver rare earth oxide electric contact material; and the contact material has the higher hardness, density and specific conductance. The silver rare earth oxide electric contact material comprises, by weight percent, 3.0% to 8.0% of Y2O3, 2.0% to 8.0% of La2O3 and the balance Ag. Raw materials used in the method are easily obtained and few, and the cost is low; the technology for combining the chemical reduction method and the high-energy ball milling method to prepare the nano silver and rare earth oxide powder is simple, industrialized production is easily achieved, the method is environment-friendly, the service life of a contact is long, and the higher hardness and density are achieved; and the contact material has the excellent electric performance, meanwhile, the electric contact properties of wear resisting, corrosion resisting, electric arc burning loss resistance, fusion welding resistance and the like are achieved, and therefore the contact performance and the reliability of an electric appliance are improved.

Description

technical field [0001] The invention belongs to the technical field of metal matrix composite materials, and in particular relates to a method for preparing a novel silver rare earth oxide electrical contact material. Background technique [0002] Any electrical system transmits a current carrying a signal or energy from one conductor to another conductor through the contact between conductors and conductors. The contact between the conductor and the conductor is called an electrical contact, and various devices with electrical contacts are key components for the transmission of electrical signals or electrical energy. Its quality and reliability directly affect the overall reliability, stability and accuracy of electrical and electronic conduction systems. An ideal electrical contact material, in order to ensure its long-term stable and reliable operation, must achieve: ①When the electrical contact passes the rated current for a long time, the temperature rise does not exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/06C22C32/00C22C1/05H01H1/0237
CPCH01H1/0237C22C1/05C22C5/06C22C32/0021B22F2998/10B22F1/17B22F2003/208B22F3/10B22F3/02B22F9/24
Inventor 胡洁琼李爱坤谢明王松孙绍霞张吉明刘满门王塞北杨有才陈永泰陈松朱刚李再久
Owner KUNMING INST OF PRECIOUS METALS
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