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Preparation method of WC-Co hard alloy series teeth for oil fields

A kind of cemented carbide and a series of technologies, applied in the field of preparation of WC-Co cemented carbide, can solve the problems of many pores, uneven grains, poor impact toughness and thermal fatigue resistance, etc., and achieve excellent comprehensive performance and excellent comprehensive performance. , the effect of stable performance

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

[0007] In order to solve the technical problems of non-uniform crystal grains, poor impact toughness and thermal fatigue, and too many pores in the preparation of existing alloys for oilfields, the invention provides a WC-Co cemented carbide series tooth for oilfields. The preparation method aims to provide a cemented carbide material that can effectively coordinate the wear resistance and toughness of cemented carbide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Select WC raw materials that are carbonized at 2100°C for 1.5 hours, with an average Fischer particle size of 32 μm, a total carbon content of 6.10-6.15%, combined carbon ≥ 6.10%, free carbon ≤ 0.05%, and oxygen content ≤ 0.08%;

[0060] The WC raw material is subjected to multi-stage screening by means of ultrasonic oscillation, the ultrasonic frequency is 20-30KHz, and the WC powder screened with 70 meshes is selected to enter the next process;

[0061] Step (2): Ingredients:

[0062] Mix the Co powder with the pretreated WC powder, wherein Co accounts for 10% by weight of the mixed material; the purity of the Co powder is ≥ 99.00%, and the Fibonacci particle size is ≤ 1.0 μm (0.3-0.4 μm ), bulk density is 0.40~0.75g / cm3, D50≤8μm, oxygen content≤0.60%, carbon content≤0.05%;

[0063] Step (3): Wet grinding:

[0064] According to the weight of raw materials, 1.8-2.3% of the paraffin wax is poured into the ball mill in the form of molten liquid 0.3-1.0 hours before the...

Embodiment 2

[0073] Select WC raw materials that are carbonized at 2180°C and have a carbonization time of 2. The average Fischer grain size is 38 μm, the total carbon content is 6.10-6.15%, combined carbon ≥ 6.10%, free carbon ≤ 0.05%, and oxygen content ≤ 0.08%;

[0074] The WC raw material is subjected to multi-stage screening by means of ultrasonic oscillation, the ultrasonic frequency is 20-30KHz, and the WC powder screened with 90 mesh is selected to enter the next process;

[0075] Step (2): Ingredients:

[0076] Mix the Co powder with the pretreated WC powder, wherein Co accounts for 10% by weight of the mixed material; the purity of the Co powder is ≥ 99.00%, and the Fibonacci particle size is ≤ 1.0 μm (0.3-0.4 μm ), bulk density is 0.40~0.75g / cm3, D50≤8μm, oxygen content≤0.60%, carbon content≤0.05%;

[0077] Step (3): Wet grinding:

[0078] According to the weight of raw materials, 1.8-2.3% of the paraffin wax is poured into the ball mill in the form of molten liquid 0.3-1.0 ho...

Embodiment 3

[0087] Select WC raw materials that are carbonized at 2300°C and have a carbonization time of 2. The average Fischer particle size is 40 μm, the total carbon content is 6.10-6.15%, combined carbon ≥ 6.10%, free carbon ≤ 0.05%, and oxygen content ≤ 0.08%;

[0088] The WC raw material is subjected to multi-stage screening by means of ultrasonic oscillation, the ultrasonic frequency is 20-30KHz, and the WC powder screened with 100 mesh is selected to enter the next process;

[0089] Step (2): Ingredients:

[0090] Mix the Co powder with the pretreated WC powder, wherein Co accounts for 10% by weight of the mixed material; the purity of the Co powder is ≥ 99.00%, and the Fibonacci particle size is ≤ 1.0 μm (0.3-0.4 μm ), bulk density is 0.40~0.75g / cm3, D50≤8μm, oxygen content≤0.60%, carbon content≤0.05%;

[0091] Step (3): Wet grinding:

[0092]According to the weight of raw materials, 1.8-2.3% of the paraffin wax is poured into the ball mill in the form of molten liquid 0.3-1.0...

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Abstract

The invention provides a preparation method of WC-Co hard alloy series teeth for oil fields. The adjustment and optimization of WC is started from carburizing temperature of raw material preparation technology and ultrasonic screening is carried out; then steps of batching, wet grinding, spray drying, compression molding and gradient sintering are carried out; the sintering step comprises successively a first-stage degreasing sintering at 300 DEG C to 550 DEG C, a second-stage vacuum sintering at 1100 DEG C to 1380 DEG C and a third-stage pressurized sintering at 1390 DEG C to 1500 DEG C; during pressurized sintering, Ar is input and the pressure is kept at 4 to 6 MPa; the WC-Co hard alloy is prepared. The WC average grain size of the prepared hard alloy is 4.0 to 6.0 [mu]m; the transverse breaking tenacity is no less than 3100 Mpa, the hardness is 86 to 87 HRA, the coercive force is 3.0 to 4.0 KA / m, and the metallographic porosity is A00, B00 and C00. The hard alloy material has excellent wear resistance and toughness performance; the product quality and comprehensive performance are excellent and the performance is stable.

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 series teeth in the field of oil field. 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 of Co=8%, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/08
CPCB22F5/08B22F2998/10B22F1/0003B22F2009/043B22F3/02B22F3/1021B22F3/1007B22F3/14
Inventor 肖华单麒铭
Owner 单麒铭
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