Novel metal surface heat treatment method of oozing nanometer diamond alkene

A technology of nanodiamondene and heat treatment method, applied in metal material coating process, coating, solid-state diffusion coating and other directions, can solve the problems of complex processing process, high equipment requirements, inconvenient machining, etc., and achieves simple and feasible process, Wide application range and convenient finishing effect

Inactive Publication Date: 2017-05-10
HENAN YUXING MICRON DIAMOND CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

[0004] These treatment methods have some disadvantages, such as complex treatment process, high equipment requirements, and some are toxic and harmful; the penetration rate is slow, the pe...
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Method used

2) system is evacuated, imports reducing protection gas, repeats...
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Abstract

A novel metal surface heat treatment method of oozing nanometer diamond alkene comprises the following steps that 1, the outer surface of a metal part to be subjected to heat treatment is coated with a layer of nano diamond alkene with the thickness of 3-5 mm; 2, a system is vacuumized, reducible protection gas is led, and the operation is repeated for 2-3 times; 3, heating is performed to reach austenite transformation temperature of 0-150 DEG C or above, heat preservation is performed for 1-20 hours, then cooling is performed along with a furnace to reach room temperature; 4, the metal part is taken out and is subjected to quenching and low-temperature tempering. A metal material made from the oozing nanometer diamond alkene prepared by adopting the novel metal surface heat treatment method is high in hardening capacity, the hardening capacity is about 10% higher than that of common carburizing treatment, the abrasion resistant can be up to more than 5 times of the abrasion resistance of a common carburizing part. A permeating layer is deep, the thickness can be up to 40 mm or above, the permeating speed is high, the average permeating speed can be up to about 1.5 mm/h, the permeating layer changes in a gradient mode, is free of an obvious interface, is high in bonding power, does not shed and facilitate follow-up fine machining. The process is simple and feasible, wide in application range, environmentally friendly and free of pollution.

Application Domain

Technology Topic

AlkeneAlkane synthesis +11

Image

  • Novel metal surface heat treatment method of oozing nanometer diamond alkene
  • Novel metal surface heat treatment method of oozing nanometer diamond alkene
  • Novel metal surface heat treatment method of oozing nanometer diamond alkene

Examples

  • Experimental program(3)

Example Embodiment

[0029] Example 1
[0030] A new type of metal surface heat treatment method with nanodiamondene infiltrating, including the following steps:
[0031] 1) The outer surface of the metal parts to be heat treated are covered with a layer of 4mm thick nanodiamondene; first, a clean container that can be sealed is needed, and 4mm thick nanodiamondene is placed on the bottom of the container, and then the metal zero Parts, and then spread a layer of nanodiamondene and then put the parts until the entire container is filled.
[0032] 2) Vacuum the system and introduce reducing protective gas, repeat 3 times, the purpose is to minimize the existence of oxidizing gas;
[0033] 3) Raise the temperature to 100°C above the austenite transformation temperature and keep it for 10 hours, then cool to room temperature with the furnace;
[0034] 4) Take out the metal parts and quench and temper at low temperature. The quenching temperature is the austenite transformation temperature and the low temperature tempering temperature is 150℃.
[0035] The nanodiamondene must undergo the following treatments: the nanodiamondenes with particle sizes of 50nm, 100nm and 200nm are mixed in a weight ratio of 1:2:4, and the obtained ones are sequentially subjected to ultrasonic alkali cleaning, ultrasonic cleaning, acid cleaning activation and ultrasonic waves Water washing and drying treatment, the specific steps are:
[0036] a) Ultrasonic alkali cleaning: Put the mixture into an ultrasonic cleaning machine equipped with lye, the ultrasonic frequency is controlled at 28KHz, the lye is 10% NaOH solution, the lye temperature is 50℃, the stirring speed is 25rpm, and the cleaning time Is 30min;
[0037] b) Ultrasonic cleaning: the ultrasonic frequency is 30KHz, the cleaning liquid is deionized water, the stirring speed is 25rpm, the stirring time is 30min, take the supernatant liquid to measure the pH value, and repeatedly clean until pH=7;
[0038] c) Pickling activation: the pickling solution is a 25% sulfuric acid solution, the pickling temperature is 50°C, the stirring speed is 20rpm, and the stirring time is controlled at 20min to achieve the purpose of activating the surface of the raw materials;
[0039] d) Ultrasonic water washing: clean at room temperature, add the mixture of step c) to deionized water and stir it ultrasonically. The ultrasonic frequency is 30KHz, the stirring speed is 20rpm, and the stirring time is 8min. Take the supernatant liquid to measure the pH value, and repeat the cleaning until the pH =7;
[0040] e) Drying: Gradually heat up to 180°C at a rate of 3°C/min, keep it for 3 hours and then cool down with the furnace temperature, and then seal it for later use. The purpose of drying is to remove the moisture in the raw materials for storage and subsequent processes.
[0041] Before heat treatment, the metal parts must be sandblasted and chemically cleaned in sequence. The steps of sandblasting are: use a sandblasting machine to clean the surface of the metal parts to reveal a smooth surface; the steps of chemical cleaning are: use absolute ethanol Or clean the surface of the metal parts with acetone 3 times to remove the oil and dust on the metal surface, and let it dry naturally.

Example Embodiment

[0042] Example 2
[0043] A new type of metal surface heat treatment method with nanodiamondene infiltrating, including the following steps:
[0044] 1) The outer surface of the metal parts to be heat treated are all wrapped with a layer of 5mm thick nanodiamondene; first, a clean container that can be sealed is needed, and 5mm thick nanodiamondene is laid on the bottom of the container, and then the metal zero Parts, and then spread a layer of nanodiamondene and then put the parts until the entire container is filled.
[0045] 2) Vacuum the system and introduce reducing protective gas, repeat 3 times, the purpose is to minimize the existence of oxidizing gas;
[0046] 3) Raise the temperature to 150°C above the austenite transformation temperature and keep it for 1-20h, then cool to room temperature along with the furnace;
[0047] 4) Take out the metal parts and quench and temper at low temperature. The quenching temperature is 50℃ above the austenite transformation temperature, and the low temperature tempering temperature is 250℃.
[0048] The nanodiamondene must undergo the following treatments: the nanodiamondenes with particle sizes of 50nm, 100nm and 200nm are mixed in a weight ratio of 2:3:5, and the obtained are sequentially subjected to ultrasonic alkali cleaning, ultrasonic cleaning, acid cleaning activation and ultrasonic Water washing and drying treatment, the specific steps are:
[0049] a) Ultrasonic alkali cleaning: Put the mixture into an ultrasonic cleaning machine equipped with lye, the ultrasonic frequency is controlled at 32KHz, the lye is 12% NaOH solution, the lye temperature is 60℃, the stirring speed is 30rpm, and the cleaning time Is 25min;
[0050] b) Ultrasonic cleaning: the ultrasonic frequency is 30KHz, the cleaning liquid is deionized water, the stirring speed is 30rpm, the stirring time is 30min, take the supernatant liquid to measure the pH value, and repeatedly clean until pH=7;
[0051] c) Pickling activation: the pickling solution is a 30% sulfuric acid solution, the pickling temperature is 60°C, the stirring speed is 25rpm, and the stirring time is controlled at 30min to achieve the purpose of activating the surface of the raw materials;
[0052] d) Ultrasonic water washing: cleaning at room temperature, add the mixture of step c) to deionized water ultrasonically and stir. The ultrasonic frequency is 45KHz, the stirring speed is 25rpm, and the stirring time is 10min. Take the supernatant liquid to measure the pH value, and repeat the cleaning until the pH =7;
[0053] e) Drying: Gradually increase the temperature to 200°C at a rate of 2°C/min, keep it for 5 hours and then cool it down with the furnace temperature, and then seal it for later use. The purpose of drying is to remove the moisture in the raw materials for storage and subsequent processes.
[0054] Before heat treatment, the metal parts must be sandblasted and chemically cleaned in sequence. The steps of sandblasting are: use a sandblasting machine to clean the surface of the metal parts to reveal a smooth surface; the steps of chemical cleaning are: use absolute ethanol Or clean the surface of metal parts with acetone 5 times to remove oil and dust on the metal surface, and let it dry naturally.

Example Embodiment

[0055] Example 3
[0056] A new type of metal surface heat treatment method with nanodiamondene. The difference is that in step 1), the outer surface of the metal parts to be heat-treated is covered with a layer of nanodiamondene with a thickness of 4mm; in step 3) the temperature is raised to Austenite Body transition temperature, the rest is the same as in Example 1.
[0057] 1. Experiment and performance testing
[0058] The alloy tool steel Cr12MoV was selected as the test object, and the nano-diamondene treatment and the common carburizing process were carried out according to the present invention, and then their main performance indexes were tested. The results are as follows:
[0059] 1.1 Change in depth of permeable layer with time
[0060] Infiltrate the two samples for 1h, 3h, 5h, 10h, 20h and 50h, and then detect the depth of the seepage layer, and the relationship between the depth of the seepage layer and the penetration time is as follows figure 1 As shown, curve A represents the relationship between the depth of the nanodiamond ene infiltration layer and the penetration time, and curve B represents the relationship between the depth of the carbonized layer and the penetration time.
[0061] From figure 1 It can be seen that the average speed of carburized nanodiamondene can reach about 1.5mm/h, which is significantly faster than the speed of ordinary carburizing, and the depth of the infiltration layer can reach more than 40mm, which is much higher than the thickness of the carburized layer. From figure 1 It can also be seen that the longer the time, the slower the penetration rate and the lower the efficiency.
[0062] 1.2 The relationship between hardness and penetration depth
[0063] Infiltrate the two samples for 10 hours, and then test the Rockwell hardness value (HRC) at different depths of the permeated layer according to the provisions of GB/T230.1-2009, such as figure 2 As shown, the curve A represents the relationship between the hardness of the nanodiamond-carburized layer and the depth of the carburized layer, and the curve B represents the relationship between the hardness of the carburized layer and the depth of penetration.
[0064] From figure 2 It can be seen that the surface hardness of the nano-diamondene material has reached 70HRC or more, which is about 8HRC higher than the surface hardness of the carburized material. Moreover, compared with carburizing, the carburized layer of nanodiamondene is deeper. As the depth of the carburized layer increases, the hardness changes in an obvious gradient, there is no obvious interface, the transition zone is wider, and the phenomenon of stress concentration is not easy to appear. The infiltrated layer has strong adhesion and is not easy to fall off, which provides the possibility for subsequent machining.
[0065] 1.3 The relationship between friction coefficient and wear time
[0066] Infiltrate the two samples for 10 hours respectively, and then perform the wear test on the MRH-3 high-speed ring block wear tester according to the requirements of GB/T12444-2006. The speed of the grinding disc is controlled at 400r/min and the test load is controlled at 50N, respectively. The relationship between friction coefficient and wear scar width with wear time is as follows image 3 , 4 Shown.
[0067] From image 3 It can be seen that the friction coefficient of the nanodiamondene cemented sample stabilized at about 0.1, which is much lower than the friction coefficient of the carburized sample 0.6.
[0068] From Figure 4 It can be seen that in the same time, the wear scar width of nanodiamondene is much smaller than that of carburized diamond, which means that the wear resistance of nanodiamondene is much higher than that of carburized samples. .
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PUM

PropertyMeasurementUnit
Depth40.0mm
Surface hardness>= 70.0
Surface hardness8.0
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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