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Chromium-based alloy heat-resistant sliding block and preparation method thereof

A chromium-based alloy and heat-resistant sliding block technology, applied in the field of powder metallurgy, can solve the problems of serious hot cracking tendency of alloys, increased manufacturing difficulty, and high production and manufacturing costs, and achieve the effects of reducing costs, excellent high-temperature strength, and high melting point.

Active Publication Date: 2019-08-16
北京科大京都高新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the patented alloy with a high Cr content of 50-80% and high content of refractory metal elements W (10.1-18.0%) and Mo (≤3.0%), when it is manufactured by induction melting, the alloy has a serious tendency to hot cracking. Especially when the vertical height is greater than 200mm, the manufacturing difficulty is greatly increased, and the manufacturing cost is high, which does not meet the development requirements of the national energy conservation and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Cr-11.0% Fe-2.0% Si-5.0% Mo heat-resistant slider

[0021] (1) Take chromium powder, low-carbon ferrochrome powder, ferrosilicon powder, and molybdenum powder according to the nominal composition ratio of the alloy, and mix them with 2% micronized wax ball mill in absolute alcohol for 24 hours, and the ball-to-material ratio is 1:1;

[0022] (2) After mixing uniformly by ball milling, place the prepared mixed powder in a vacuum dryer at 80°C for 12 hours;

[0023] (3) Design the colloidal sheath according to the size of the heat-resistant slider, pack the dry mixed powder into the sheath, and perform cold isostatic pressing under the conditions of a pressure of 400MPa and a holding time of 30s;

[0024] (4) dewax the heat-resistant slider green body after forming in a vacuum degreasing sintering furnace, and -1 Pa ultimate vacuum degree, sintering and densification at 1350°C temperature for 5 hours to obtain high-performance chromium-based alloy heat-resista...

Embodiment 2

[0027] Example 2: Cr-20.0% Fe-0.5% Si-3.1% Mo heat-resistant slider

[0028] (1) Weigh chromium powder, low-carbon ferrochrome powder, ferrosilicon powder, and molybdenum powder according to the nominal composition ratio of the alloy, and ball mill and mix them with 4% phenolic resin in n-hexane for 5 hours, and the ball-to-material ratio is 5:1;

[0029] (2) After ball milling and mixing evenly, the prepared mixed powder was dried in a vacuum dryer at 150°C for 4 hours;

[0030] (3) Design the colloidal sheath according to the size of the heat-resistant slider, pack the dry mixed powder into the sheath, and perform cold isostatic pressing under the conditions of a pressure of 100 MPa and a holding time of 10 minutes;

[0031] (4) Remove the phenolic resin from the heat-resistant slider green body after molding in a vacuum degreasing sintering furnace, and -3 Pa ultimate vacuum degree, sintering and densification at 1600°C for 1 hour to obtain high-performance chromium-based ...

Embodiment 3

[0032] Example 3: Cr-16.0% Fe-1.2% Si-4.0% Mo heat-resistant slider

[0033] (1) Take by weighing chromium powder, low-carbon ferrochrome powder, ferrosilicon powder, molybdenum powder according to the distribution ratio of alloy nominal composition, ball mill and mix 15h with 5% rubber gasoline solution in acetone, the ball material ratio is 3: 1;

[0034] (2) After ball milling and mixing evenly, the prepared mixed powder was dried in a vacuum dryer at 120°C for 8 hours;

[0035] (3) Design the colloidal sheath according to the size of the heat-resistant slider, pack the dry mixed powder into the sheath, and perform cold isostatic pressing under the conditions of a pressure of 240 MPa and a holding time of 4 minutes;

[0036] (4) Degumming the heat-resistant slider green body after forming in a vacuum degreasing sintering furnace, and -2 Pa ultimate vacuum degree, sintering and densification at 1450°C for 3 hours to obtain high-performance chromium-based alloy heat-resistan...

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Abstract

The invention relates to a chromium-based alloy heat-resistant sliding block and a preparation method thereof, and belongs to the technical field of powder metallurgy high-temperature materials. A chromium-based alloy is prepared from chemical components in percentage by weight: 11.0-20.0% of Fe, 0.5-2.0% of Si, 3.1-5.0% of Mo, less than or equal to 0.05% of C and the balance of Cr. The chromium-based alloy heat-resistant sliding block is prepared by taking chromium powder, low carbon chromium iron powder, silicon iron powder and molybdenum powder as raw materials which are subjected to ball grinding mixing, isostatic cool pressing forming and vacuum sintering near-net forming. The chromium-based alloy has excellent high-temperature strength and antioxidant properties, a heat-resistant sliding block manufacturing technology saves energy and is environmentally friendly, and the chromium-based alloy can also be applied and popularized in parts used in other high-temperature environments.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, belongs to the category of high-temperature alloy materials, and in particular provides a chromium-based alloy heat-resistant slider in contact with a high-temperature billet and a preparation method thereof. [0002] technical background [0003] There are two types of steel rolling heating furnaces: pusher furnace and walking furnace. In the past, the water beams in the heating furnace were water-cooled, and heat-resistant pads were welded on the water beams, and the billets were heated on the heat-resistant pads. At present, the water beam is cooled by vaporization, which improves the thermal efficiency and the heating quality of the steel billet. At the same time, the temperature of the upper surface of the pad in the furnace is greatly increased, resulting in the crushing and deformation of the pad and the drop in height. Thermal engineering technicians have found through experiment...

Claims

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Application Information

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IPC IPC(8): C22C27/06B22F1/00B22F3/04B22F3/10
CPCC22C27/06B22F3/04B22F3/10B22F1/10
Inventor 刘勇
Owner 北京科大京都高新技术有限公司
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