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Preparation process of copper-based powder contact and relay formed by prepared contact

A copper-based powder, preparation process technology, applied in the direction of relays, electromagnetic relays, electromagnetic relay details, etc., can solve problems such as billet cracks, no cooling steps, etc.

Active Publication Date: 2021-05-18
CIVIL AVIATION FLIGHT UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that there is no professional cooling step in the preparation process of the existing copper-based powder contact, so that when the billet after the primary sintering is pressed for the second time, because the billet is not completely cooled, the The problem of cracks inside the billet during pressing

Method used

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  • Preparation process of copper-based powder contact and relay formed by prepared contact
  • Preparation process of copper-based powder contact and relay formed by prepared contact
  • Preparation process of copper-based powder contact and relay formed by prepared contact

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, the preparation process of copper-based powder contacts includes the following steps: S1. Primary powder mixing: raw material copper, raw material bismuth, raw material Al2O3, raw material boron carbide, raw material ditungsten pentaboride, raw material cerium, raw material The lanthanum and raw graphite are finely ground with a high-energy ball mill, and the mixed powder I is obtained after ball milling; S2. Filtration and drying: the mixed powder I is filtered with a filter device to obtain the filtered mixed powder II, and the mixed powder II is Drying under vacuum conditions; S3. One-time pressing: Press the mixed powder II on a hydraulic press with a pressure of 320MPa to form a billet. After the pressing pressure reaches 320MPa, keep the pressure for 2 minutes; S4. Sintering in the atmosphere furnace at 800°C; S5. Cooling: Fill the furnace with a rare gas at room temperature (25°C) for 35 minutes after the primary sintering, and then cha...

Embodiment 2

[0041] The difference between this embodiment and Example 1 is: in the step S1 of this embodiment, the ingredients are different when the raw materials are batched according to the weight components. 1.3 parts of aluminum oxide, 2 parts of raw material boron carbide, 0.9 parts of raw material ditungsten pentaboride, 0.1 part of raw material cerium, 0.07 part of raw material lanthanum, 3 parts of raw material graphite, and 88 parts of raw material copper. In this embodiment, the primary sintering temperature in step S4 is 900° C., the duration of the initial injection of rare gas at room temperature in step S5 is 40 min, and the secondary sintering temperature in step S7 is 500° C. In the same manner as in Example 1, the comparative detection of the crack rate of the billet was carried out. The crack rate of the billet in this embodiment was less than 4.2%. Obviously, this embodiment can significantly reduce the probability of cracks in the billet after secondary pressing.

Embodiment 3

[0043] The difference between this embodiment and Example 1 is that in step S1 of this embodiment, the ingredients are different when the raw materials are batched according to the weight components. 0.5 parts of aluminum oxide, 0.5 parts of boron carbide as a raw material, 1.5 parts of ditungsten pentaboride as a raw material, 0.05 parts of cerium as a raw material, 0.1 part of lanthanum as a raw material, 2 parts of graphite as a raw material, and 96 parts of copper as a raw material. In this embodiment, the primary sintering temperature in step S4 is 1000° C., the duration of the initial injection of rare gas at room temperature in step S5 is 30 minutes, and the secondary sintering temperature in step S7 is 550° C. Using the same method as in Example 1 to carry out comparative detection of the crack rate of the billet, the crack rate of the billet in this embodiment is less than 4.4%. Obviously, this embodiment can significantly reduce the probability of cracks in the billet...

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Abstract

The invention discloses a preparation process of a copper-based powder contact. The preparation process comprises the following steps: S1, performing primary powder mixing; S2, performing filtering and drying; S3, performing primary pressing; S4, performing primary sintering; S5, performing cooling: after the primary sintering is finished, introducing room-temperature rare gas into a furnace for 30-40 minutes, then changing the temperature of the rare gas filled into the furnace, gradually reducing the temperature of the rare gas to 20 DEG C from 100 DEG C in an equal difference manner at a difference value of 10 DEG C, maintaining the filling time of the rare gas at each temperature gradient for 5 minutes, then taking out a blank ingot after the primary sintering, and cooling the blank ingot through a cooling device; S6, performing secondary pressing; S7, carrying out secondary sintering; and S8, performing rolling, wiredrawing and blanking. The invention also discloses a relay formed by the contact prepared by the preparation process. According to the method, the professional cooling step is added in the traditional metal powder metallurgy process, so that the blank ingot subjected to primary sintering can be completely cooled after the cooling step, and the blank ingot is prevented from generating cracks during secondary pressing to influence the property of the contact.

Description

technical field [0001] The invention relates to the technical field of contact preparation, in particular to a preparation process of a copper-based powder contact and a relay composed of the prepared contact. Background technique [0002] The relay is an automatic electrical appliance that switches on or off the control circuit to realize automatic control and protection of power devices according to changes in certain input signals. There are many types of relays, which can be divided into: voltage relays, current relays, time relays, temperature relays, speed relays, pressure relays, etc. according to the nature of the input signal; according to the working principle can be divided into: electromagnetic relays, induction relays, electric relays Relays, electronic relays, etc. Among them, the electromagnetic relay is generally composed of a coil, an iron core, and one or several sets of reeds with contacts. The contacts are divided into moving contacts and static contacts...

Claims

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Application Information

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IPC IPC(8): H01H11/04H01H50/54H01H1/50H01H1/04B22F5/00B22F3/16B22F3/10B22F1/00
CPCH01H11/048H01H50/54H01H1/50H01H1/04B22F5/00B22F3/16B22F3/1007B22F1/14
Inventor 周跃飞林琳
Owner CIVIL AVIATION FLIGHT UNIV OF CHINA
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