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A preparation method of wc-co cemented carbide oil field nozzle

A cemented carbide and oil field technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of poor wear resistance, poor impact toughness and thermal fatigue, and many pores, so as to improve comprehensive performance and stability Effect

Inactive Publication Date: 2019-09-24
HUNAN CENTURY SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the technical problems such as uneven crystal grains, poor impact toughness and thermal fatigue resistance, too many pores, poor wear resistance, and unstable product quality in the preparation of existing alloys for oilfields, the invention provides a WC - The preparation method of Co cemented carbide oilfield nozzles aims to provide a nozzle product that can effectively coordinate the cemented carbide oil teeth to cooperate with the use of the oilfield tooth series, thereby improving the comprehensive performance of the oilfield tooth series alloys, Expand the application range of mining alloys and provide high-quality and low-cost alloys for the field of oil gear series

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Step (1): Preprocessing:

[0075] Select the above-mentioned Fischer particle size of 23 μm, total carbon content of 6.13%, combined carbon ≥ 6.10%, free carbon ≤ 0.05%, oxygen content ≤ 0.05, and carbonize WC raw materials at a high temperature of 2000-2200 °C; WC after high-temperature carbonization The powder is sieved in multiple stages by means of ultrasonic oscillation, the ultrasonic frequency is 20-30KHz, and the WC powder in the 120-level area is selected to enter the next process

[0076] Step (2): Ingredients:

[0077] Mix Co powder, WC powder, TaC, and NbC; based on 100% of the total weight of the material after batching, Co powder accounts for 9.0wt%, TaC / NbC accounts for 0.41wt%, and the balance is WC;

[0078] The Fischer particle size of the Co powder is 1.85 μm;

[0079] Step (3): Wet grinding:

[0080] According to the weight of raw materials, 1.8-2.3% paraffin wax is poured into the ball mill in the form of molten liquid 0.3-1.0 hours before the sl...

Embodiment 2

[0092] Step (1): Preprocessing:

[0093] Select the above-mentioned Fischer particle size of 19 μm, total carbon content of 6.14%, combined carbon ≥ 6.10%, free carbon ≤ 0.05%, oxygen content ≤ 0.05, and carbonize WC raw materials at a high temperature of 2000-2200 °C; WC after high-temperature carbonization The powder is sieved in multiple stages by means of ultrasonic oscillation, the ultrasonic frequency is 20-30KHz, and the WC powder in the 100-level area is selected to enter the next process

[0094] Step (2): Ingredients:

[0095] Mix Co powder, WC powder, TaC, and NbC; based on 100% of the total weight of the material after batching, Co powder accounts for 9.0wt%, TaC / NbC accounts for 0.38wt%, and the balance is WC;

[0096] The Fischer particle size of the Co powder is 3.40 μm;

[0097] Step (3): Wet grinding:

[0098] According to the weight of raw materials, 1.8-2.3% paraffin wax is poured into the ball mill in the form of molten liquid 0.3-1.0 hours before the sl...

Embodiment 3

[0110] Step (1): Preprocessing:

[0111] Select the above-mentioned Fischer particle size of 24 μm, total carbon content of 6.13%, combined carbon ≥ 6.10%, free carbon ≤ 0.05%, oxygen content ≤ 0.05, and carbonize WC raw materials at a high temperature of 2000-2200 °C; WC after high-temperature carbonization The powder is multi-stage sieved by means of ultrasonic oscillation, the ultrasonic frequency is 20-30KHz, and the WC powder in the 90-level area is selected to enter the next process

[0112] Step (2): Ingredients:

[0113] Mixing Co powder, WC powder, TaC, and NbC; based on 100% of the total weight of the material after batching, Co powder accounts for 9.0wt%, TaC / NbC accounts for 0.54wt%, and the balance is WC;

[0114] The Fischer particle size of the Co powder is 4.5 μm;

[0115] Step (3): Wet grinding:

[0116] According to the weight of raw materials, 1.8-2.3% paraffin wax is poured into the ball mill in the form of molten liquid 0.3-1.0 hours before the slurry i...

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Abstract

The invention provides a method for preparing WC-Co cemented carbide oilfield nozzles. Co powder, WC powder, TaC and NbC are mixed together to prepare the WC-Co hard alloy through wet grinding, spray drying, compression molding and sintering. alloy; when batching, based on 100% of the total weight of the material after batching, Co powder accounts for 8.5 to 13 wt%, and TaC / NbC accounts for 0.35 to 0.55 wt%; the balance is WC; ℃, heat preservation, then raise the temperature to 400-500°C at a hydrogen flow rate of 55-65L / min and keep it warm, then raise the temperature to 550-650°C at a hydrogen flow rate of 35-45L / min and keep it warm; then heat it at 600-1000 Under the mixed atmosphere of CH4:H2=1~2:98~99 at 35~45L / min, the carbon content is corrected; then at 1000~1200℃, CH4:H2=1~4:96~99 Precise correction of the amount of heat-preserving carbon under the mixed atmosphere; finally, the hard alloy is obtained through sintering treatment. In the present invention, it is helpful to improve the comprehensive performance and production stability of the WC-Co cemented carbide oilfield nozzle.

Description

technical field [0001] The invention relates to a preparation method of cemented carbide, in particular to a preparation method of WC-Co cemented carbide used for nozzles in the field of oil fields. Background technique [0002] Cemented carbide is one or more high hardness, high modulus refractory metal carbides (WC, TiC, Cr 2 C 3 ) is a multiphase composite material composed of transition metals (Fe, Co, Ni, etc.) or other alloys as the binder phase. This kind of composite structural material has the high hardness, high wear resistance, and red hardness of ceramics, as well as the high strength and toughness of metals; and this specific "double high" performance is exactly the goal pursued by material researchers. [0003] Tungsten carbide-cobalt is a good example of "double high" cemented carbide or cermet. Its grade is composed of YG and the percentage of average cobalt content. For example, YG8 means tungsten-cobalt cemented carbide with an average WCo=8%, and the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/02B22F3/10B22F3/14B22F1/00B22F5/10C22C29/08C22C1/05C22C1/10
CPCC22C1/051C22C29/067C22C29/08B22F3/02B22F3/1021B22F3/14B22F5/10B22F2998/10B22F1/14
Inventor 肖华单麒铭
Owner HUNAN CENTURY SPECIAL ALLOY
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