Three-stage carbon-nitrogen-boron ternary gas deep co-infiltration method for low carbon nickel molybdenum steel

A ternary gas, nickel-molybdenum steel technology, applied in coating, solid-state diffusion coating, metal material coating process, etc., can solve the problem that cannot meet the requirements of high hardness and high wear resistance, deep infiltration of N or co-infiltration technology Insufficient, affecting the impact toughness performance indicators and other problems, to achieve the effect of good hardness, fatigue life improvement, hardness improvement

A ternary gas, nickel-molybdenum steel technology, applied in coating, solid-state diffusion coating, metal material coating process, etc., can solve the problem that cannot meet the requirements of high hardness and high wear resistance, deep infiltration of N or co-infiltration technology Insufficient, affecting the impact toughness performance indicators and other problems, to achieve the effect of good hardness, fatigue life improvement, hardness improvement

CN110592524BActive Publication Date: 2021-08-17XI'AN PETROLEUM UNIVERSITY
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  • Three-stage carbon-nitrogen-boron ternary gas deep co-infiltration method for low carbon nickel molybdenum steel
  • Three-stage carbon-nitrogen-boron ternary gas deep co-infiltration method for low carbon nickel molybdenum steel
  • Three-stage carbon-nitrogen-boron ternary gas deep co-infiltration method for low carbon nickel molybdenum steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment includes the following steps:

[0021] (1) Prepare a boron-donating agent, by weight percentage, 2% of lanthanum oxide rare earth, 5% of boron carbide, 15% of potassium fluoroborate, and the balance is silicon carbide, uniformly mixed and bonded and dried into a solid block; in addition, Prepare the carbon-nitrogen co-infiltration solution, the co-infiltration solution is calculated by mass percentage, and is composed of 50% carbonamide, 40% sodium carbonate and 10% sodium chloride;

[0022] (2) The 20Ni to be processed 4 The Mo steel drill bit workpiece is placed in a drop-controlled carburizing furnace, heated to 860°C, and exhausted for 1 hour;

[0023] (3) The three-stage co-infiltration method is used to carry out the gas three-component deep co-infiltration process

[0024] 3.1. The first stage is mainly carburizing. The initial heating temperature is 860°C for 2 hours and then carburizing. Among them, methanol is 40 drops / minute, kerosene is 120...

Embodiment 2

[0033] This embodiment includes the following steps:

[0034] (1) Prepare a boron-donating agent, by weight percentage, 2% of lanthanum oxide rare earth, 5% of boron carbide, 15% of potassium fluoroborate, and the balance is silicon carbide, uniformly mixed and bonded and dried into a solid block; in addition, Prepare the carbon-nitrogen co-infiltration solution, the co-infiltration solution is calculated by mass percentage, and is composed of 50% carbonamide, 40% sodium carbonate and 10% sodium chloride;

[0035] (2) The 20Ni to be processed 4 The Mo steel drill bit workpiece is placed in a drop-controlled carburizing furnace, heated to 860°C, and exhausted for 1 hour;

[0036] (3) The three-stage co-infiltration method is used to carry out the gas three-component deep co-infiltration process

[0037] 3.1. The first stage is mainly carburizing. The initial heating temperature is 860°C for 2 hours and then carburizing. Among them, methanol is 40 drops / minute, kerosene is 120...

Embodiment 3

[0046] This embodiment includes the following steps:

[0047] (1) Prepare a boron-donating agent, by weight percentage, lanthanum oxide rare earth 2.5%, boron carbide 10%, potassium fluoroborate 15%, and the balance is silicon carbide, uniformly mixed and bonded and dried into a solid block; in addition, Prepare the carbon-nitrogen co-infiltration solution, the co-infiltration solution is calculated by mass percentage, and is composed of 50% carbonamide, 40% sodium carbonate and 10% sodium chloride;

[0048] (2) The 20Ni to be processed 4 The Mo steel drill bit workpiece is placed in a drop-controlled carburizing furnace, heated to 860°C, and exhausted for 1 hour;

[0049] (3) The three-stage co-infiltration method is used to carry out the gas three-component deep co-infiltration process

[0050] 3.1. The first stage is mainly carburizing. The initial heating temperature is 860°C for 2 hours and then carburizing. Among them, methanol is 40 drops / minute, kerosene is 140 drops...

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Abstract

Three-stage carbon-nitrogen-boron ternary gas deep co-infiltration method for low-carbon nickel-molybdenum steel. The low-carbon nickel-molybdenum steel is placed in the carburizing furnace and added with kerosene, anhydrous methanol, liquid ammonia, boric acid and oxidation. The co-infiltration agent composed of lanthanum, using the chemical heat treatment method under the action of lanthanum oxide and other catalysts, adopts the three-stage ternary gas co-infiltration process, and finally obtains fine acicular martensite, nitrides and borides on the surface, which greatly improves the durability of parts. Hardness and wear resistance; the method of the present invention has low cost, simple and controllable process, and provides technical support for the production of high-strength and high-wear-resistant surface-modified drill bits, so it has a wide range of applications in the fields of precision machining, national defense industry, and oil drilling. prospect.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a three-stage carbon-nitrogen-boron ternary gas deep co-infiltration method for low-carbon nickel-molybdenum steel. Background technique [0002] The drill bit is an important tool for oil drilling. The drill bit for oil drilling plays the role of impacting, crushing and shearing the formation rock when it rotates. Its working performance will directly affect the drilling quality, drilling efficiency and drilling cost. Carbon technology has gradually become unsatisfactory. [0003] In recent years, scientific researchers have done a lot of work on the synthesis and preparation of boron carbon nitrogen materials, among which the ternary co-infiltration has a relevant research basis. As disclosed in the Chinese patent application "A boron-carbon-nitrogen ternary co-infiltration method" (application number: CN02109879.4) with the publication number CN1442504A, a solid boron supply agen...

Claims

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Application Information

Patent Timeline
17 Aug 2021
Publication
CN110592524B
IPC
C23C8/58; C23C8/46; C23C8/42; C23C8/56
CPC
C23C8/42; C23C8/46; C23C8/56; C23C8/58
Inventors
付甲; 魏胜利