Preparation method for WC-Co cemented carbide nozzle for oil field

A cemented carbide and nozzle technology, which is applied in the field of WC-Co cemented carbide preparation, can solve the problems of many pores, poor wear resistance, uneven grains, etc.

Inactive Publication Date: 2017-05-31
单麒铭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the technical problems such as uneven crystal grains, poor impact toughness and thermal fatigue resistance, too many pores, and poor wear resistance in the preparation of existing alloys for oilfields, the invention provides a WC-Co hard alloy for oilfields. The preparation method of cemented carbide nozzles aims to provide a n

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Step (1): Preprocessing:

[0068] 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 ≤ 0.08, 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

[0069] Step (2): Ingredients:

[0070] 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;

[0071] The Fischer particle size of the Co powder is 1.85 μm;

[0072] Step (3): Wet grinding:

[0073] 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

[0082] Step (1): Preprocessing:

[0083] 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 ≤ 0.08, 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

[0084] Step (2): Ingredients:

[0085] 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;

[0086] The Fischer particle size of the Co powder is 3.40 μm;

[0087] Step (3): Wet grinding:

[0088] 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

[0097] Step (1): Preprocessing:

[0098] 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 ≤ 0.08, 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

[0099] Step (2): Ingredients:

[0100] 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;

[0101] The Fischer particle size of the Co powder is 4.5 μm;

[0102] Step (3): Wet grinding:

[0103] 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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PUM

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Abstract

The invention provides a preparation method for a WC-Co cemented carbide nozzle for an oil field. Co powder, WC powder, TaC and NbC are mixed and then subjected to wet grinding, drying, plasticizer adding, pressing forming, plasticizer removal and sintering, so that WC-Co cemented carbide is obtained; during mixing, based on the total weight 100% of the mixed materials, Co powder accounts for 8.5-13wt%, TaC/NbC accounts for 0.35-0.55wt%, and the rest is WC. The synergism of the materials and proportioning in the mixing process is favorable for inhibiting growth of grains and improving the alloy structure after sintering, thereby improving the toughness, high-temperature strength and hardness of the alloy, improving the heat impact resistance and heat fatigue resistance of the alloy, purifying the grain boundary, and increasing the interface binding force. Distribution of the Co phase is more uniform, and the toughness and abrasion resistance of the alloy are greatly unified.

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, Ti C, 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 ...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05C22C1/10B22F5/10
CPCC22C29/08B22F5/10C22C1/051C22C29/067
Inventor 肖华单麒铭
Owner 单麒铭
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