Method for producing WC-Co hard alloy oilfield spray nozzles

A cemented carbide, 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, and achieve comprehensive performance and stability. Effect

Inactive Publication Date: 2017-05-10
HUNAN CENTURY SPECIAL ALLOY
View PDF6 Cites 6 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention provides a method for producing WC-Co hard alloy oilfield spray nozzles. The method includes compounding, by weight, 8.5-13% of Co powder, 0.35-0.55% of Tac, 0.35-0.55% of Nbc and the balance WC powder, and conducting wet grinding, spray drying, pressing forming and sintering so as to obtain WC-Co hard alloy, wherein a sintering process includes holding at 300-500 DEG C, heating to 400-500 DEG C at a hydrogen flow speed of 55-65 L/min prior to holding, heating to 550-650 DEG C at a hydrogen flow speed of 35-45 L/min prior to holding, conducting carbon correction in a mixed atmosphere with a ratio of CH4 to H2 being (1-2) to (98-99) at a mixed atmosphere flow speed of 35-45 L/min and at 600-1,000 DEG C, holding in a mixed atmosphere with a ratio of CH4 to H2 being (1-4) to (96-99) at 1,000-1,200 DEG C for precise carbon correction. The method is beneficial to improvement in comprehensive performance and production stability of the WC-Co hard alloy oilfield spray nozzles.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap