In-situ formation preparation method for gradient WC-strengthened CuW composite material

Abstract

The invention discloses an in-situ formation preparation method for a gradient WC-strengthened CuW composite material. The in-situ formation preparation method for the gradient WC-strengthened CuW composite material comprises the steps that a tungsten framework is heated in a vacuum carburization furnace under the protection of argon, then a furnace body is vacuumized, acetylene is introduced into the furnace body, the furnace body is kept in the state for 2-10 min, the furnace body is vacuumized again till the pressure in the furnace body reaches 1 Pa, then heat preservation is conducted, heat preservation is conducted again after the operation is circulated, then nitrogen is introduced into the furnace body, and a sample is cooled along with the furnace, so that a gradient WC-strengthened W framework is obtained; and copper infiltration is conducted on the gradient WC-strengthened W framework in a microcomputer program-control sintering furnace in a high-temperature hydrogen atmosphere, and then the gradient WC-strengthened CuW composite material is obtained. By the adoption of the preparation method, the high-temperature strength and abrasion resistance of the W framework are improved; meanwhile, in the carburization process, the WC component gradient exists between the interior and the exterior of the framework under the influence of the carbon potential in the framework and the carbon potential outside the framework.

Description

technical field

[0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of an in-situ self-generated gradient WC reinforced CuW composite material. Background technique

[0002] As the core component of the overall contact, the CuW composite material is mainly responsible for the connection and disconnection of the circuit breaker, and plays an important role in the transmission of ultra-high voltage and ultra-high voltage power grids. With the increase of grid capacity and the improvement of stability, more stringent requirements are put forward for CuW composite materials for integral contacts. After the traditional CuW composite material is opened and closed at high frequency, its wear resistance and high temperature stability are significantly reduced, which cannot meet the requirements of high frequency and long life.

[0003] Existing studies have shown that adding rare earth oxides and c...

Examples

Embodiment 1

[0029] Step 1, prepare the W skeleton:

[0030] Mix W powder and 3% induced Cu powder through a V-type mixer and press on a hydraulic press to form a green body with a density of 70%, and then sinter in a hydrogen atmosphere protection furnace at 1300°C for 40 minutes to obtain a W skeleton;

[0031] Step 2, vacuum carburizing:

[0032] Heat the W skeleton obtained in step 1 to 900°C in a vacuum carburizing furnace under the protection of an inert atmosphere. After reaching the temperature, turn on the vacuum pump to pump the furnace body to 0.8 Pa, pass in 800 Pa acetylene, keep it for 5 minutes, and then pump the furnace body to 0.8 Pa. To 1Pa, keep warm for 20 minutes, repeat the above operation 3 times and keep warm for 60 minutes, then pass nitrogen gas to cool the sample with the furnace, and then get the WC gradient strengthened W skeleton;

[0033] Step 3, Infiltration:

[0034] The WC gradient strengthened W skeleton obtained in step 2 was infiltrated with copper at...

Embodiment 2

[0036] Step 1, prepare the W skeleton:

[0037] W powder, 3% inductive Cu powder and 1% activating element Ni powder were mixed by a V-type mixer and pressed on a hydraulic press to form a green body with a density of 70%. Sintering for 40min to obtain the W skeleton;

[0038] Step 2, vacuum carburizing:

[0039] Heat the W skeleton obtained in step 1 to 950°C in a vacuum carburizing furnace under the protection of an inert atmosphere. After reaching the temperature, turn on the vacuum pump to pump the furnace body to 1Pa, pass in 1000Pa acetylene, keep it for 2min, and then pump the furnace body to 1Pa, keep warm for 5min, repeat the above operation 10 times and keep warm for 40min, then pass nitrogen gas to cool the sample with the furnace, and then get the WC gradient strengthened W skeleton;

[0040] Step 3, Infiltration:

[0041] The WC gradient strengthened W skeleton obtained in step 2 was infiltrated with copper at 1350 ° C for 2 hours in a computer-programmed high-...

Embodiment 3

[0043] Step 1, prepare the W skeleton:

[0044] W powder, 3% inductive Cu powder and 1% activating element Ni powder were mixed by a V-type mixer and pressed on a hydraulic press to form a green body with a density of 70%. Sintering for 40min to obtain the W skeleton;

[0045] Step 2, vacuum carburizing:

[0046] Heat the W skeleton obtained in step 1 to 1100°C in a vacuum carburizing furnace under the protection of an inert atmosphere. After reaching the temperature, turn on the vacuum pump to pump the furnace body to 1.2Pa, pass in 1200Pa acetylene, keep it for 10min, and then pump the furnace body to 1.2Pa. To 1Pa, keep warm for 10min, repeat the above operation twice and keep warm for 30min, then pass nitrogen gas to cool the sample with the furnace, and then get the WC gradient strengthened W skeleton;

[0047] Step 3, Infiltration:

[0048] The WC gradient strengthened W skeleton obtained in step 2 was infiltrated with copper at 1400°C for 0.5h in a computer-programme...

technical field

[0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of an in-situ self-generated gradient WC reinforced CuW composite material. Background technique

[0002] As the core component of the overall contact, the CuW composite material is mainly responsible for the connection and disconnection of the circuit breaker, and plays an important role in the transmission of ultra-high voltage and ultra-high voltage power grids. With the increase of grid capacity and the improvement of stability, more stringent requirements are put forward for CuW composite materials for integral contacts. After the traditional CuW composite material is opened and closed at high frequency, its wear resistance and high temperature stability are significantly reduced, which cannot meet the requirements of high frequency and long life.

[0003] Existing studies have shown that adding rare earth oxides and c...

Examples

Embodiment 1

[0029] Step 1, prepare the W skeleton:

[0030] Mix W powder and 3% induced Cu powder through a V-type mixer and press on a hydraulic press to form a green body with a density of 70%, and then sinter in a hydrogen atmosphere protection furnace at 1300°C for 40 minutes to obtain a W skeleton;

[0031] Step 2, vacuum carburizing:

[0032] Heat the W skeleton obtained in step 1 to 900°C in a vacuum carburizing furnace under the protection of an inert atmosphere. After reaching the temperature, turn on the vacuum pump to pump the furnace body to 0.8 Pa, pass in 800 Pa acetylene, keep it for 5 minutes, and then pump the furnace body to 0.8 Pa. To 1Pa, keep warm for 20 minutes, repeat the above operation 3 times and keep warm for 60 minutes, then pass nitrogen gas to cool the sample with the furnace, and then get the WC gradient strengthened W skeleton;

[0033] Step 3, Infiltration:

[0034] The WC gradient strengthened W skeleton obtained in step 2 was infiltrated with copper at...

Embodiment 2

[0036] Step 1, prepare the W skeleton:

[0037] W powder, 3% inductive Cu powder and 1% activating element Ni powder were mixed by a V-type mixer and pressed on a hydraulic press to form a green body with a density of 70%. Sintering for 40min to obtain the W skeleton;

[0038] Step 2, vacuum carburizing:

[0039] Heat the W skeleton obtained in step 1 to 950°C in a vacuum carburizing furnace under the protection of an inert atmosphere. After reaching the temperature, turn on the vacuum pump to pump the furnace body to 1Pa, pass in 1000Pa acetylene, keep it for 2min, and then pump the furnace body to 1Pa, keep warm for 5min, repeat the above operation 10 times and keep warm for 40min, then pass nitrogen gas to cool the sample with the furnace, and then get the WC gradient strengthened W skeleton;

[0040] Step 3, Infiltration:

[0041] The WC gradient strengthened W skeleton obtained in step 2 was infiltrated with copper at 1350 ° C for 2 hours in a computer-programmed high-...

Embodiment 3

[0043] Step 1, prepare the W skeleton:

[0044] W powder, 3% inductive Cu powder and 1% activating element Ni powder were mixed by a V-type mixer and pressed on a hydraulic press to form a green body with a density of 70%. Sintering for 40min to obtain the W skeleton;

[0045] Step 2, vacuum carburizing:

[0046] Heat the W skeleton obtained in step 1 to 1100°C in a vacuum carburizing furnace under the protection of an inert atmosphere. After reaching the temperature, turn on the vacuum pump to pump the furnace body to 1.2Pa, pass in 1200Pa acetylene, keep it for 10min, and then pump the furnace body to 1.2Pa. To 1Pa, keep warm for 10min, repeat the above operation twice and keep warm for 30min, then pass nitrogen gas to cool the sample with the furnace, and then get the WC gradient strengthened W skeleton;

[0047] Step 3, Infiltration:

[0048] The WC gradient strengthened W skeleton obtained in step 2 was infiltrated with copper at 1400°C for 0.5h in a computer-programme...

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