A method for toughening and corrosion-resistant Mo2NiB2 ceramics by trace doping with nano-FeO

Abstract

The present invention discloses a method for toughening corrosion-resistant Mo2NiB2 ceramics with trace amounts of FeO-doped nanoparticles, belonging to the field of ceramic preparation technology. The method employs trace amounts of FeO-doped nanoparticles to toughen corrosion-resistant Mo2NiB2 ceramics. The toughened Mo2NiB2 ceramics exhibit significant dimple formation and a significant toughening effect, increasing their toughness by more than 2 times.

Description

Technical Field

[0001] The invention belongs to the technical field of ceramic preparation, and in particular relates to a method for toughening and corrosion-resistant Mo2NiB2 ceramics by trace doping with nano-FeO. Background Art

[0002] Mo2NiB2 ceramics are different from Mo2NiB2-based metal ceramics. The former fully utilizes the single hard phase Mo2NiB2 block to exert its excellent wear resistance and corrosion resistance, and has a wide range of application prospects. For example, it has important application prospects in high-temperature oxidation pipes and containers, cutting tools and other components or component coatings. Although Mo2NiB2 ceramics have obvious cost-effectiveness advantages over other W- and Co-containing ceramics, if the toughness of Mo2NiB2 ceramics can be significantly improved, its application will become more extensive. Obviously, the invention of a method for toughening and corrosion-resistant Mo2NiB2 ceramics with trace amounts of FeO doping has important innovation and engineering application significance. Summary of the Invention

[0003] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0004] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for toughening and corrosion-resistant Mo2NiB2 ceramics by trace doping with nano-FeO.

[0006] In order to solve the above technical problems, the present invention provides the following technical solution, including weighing FeO powder and Mo2NiB2 powder in a mass ratio of (0.01~0.1):1 and mixing them evenly to obtain mixed powder; ball milling the mixed powder and then vacuum pressure sintering it; cooling after sintering to obtain FeO toughened Mo2NiB2 ceramics.

[0007] As a preferred solution of the method of micro-doping nano-FeO to toughen and corrosion-resistant Mo2NiB2 ceramics of the present invention, the purity of the FeO powder is ≥98% and the particle size is ≤200nm.

[0008] As a preferred solution of the method of micro-doping nano-FeO to toughen and corrosion-resistant Mo2NiB2 ceramics of the present invention, the purity of the Mo2NiB2 powder is ≥99% and the particle size is ≤300μm.

[0009] As a preferred solution of the method of micro-doping nano-FeO to toughen and corrosion-resistant Mo2NiB2 ceramics according to the present invention, the ball-to-material ratio is 9-10:1, the ball milling speed is 200-300 rpm, and the time is 4-20 hours.

[0010] As a preferred solution of the method of trace-doping nano-FeO to toughen and corrosion-resistant Mo2NiB2 ceramics of the present invention, the heating rate of the vacuum pressure sintering is 2-5°C / s.

[0011] As a preferred solution of the method of trace-doping nano-FeO to toughen and corrosion-resistant Mo2NiB2 ceramics according to the present invention, the sintering temperature of the vacuum pressure sintering is 900-1200°C.

[0012] As a preferred solution of the method of the present invention for toughening and corrosion-resistant Mo2NiB2 ceramics with trace amounts of doped nano-FeO, the sintering time of the vacuum pressure sintering is 10 to 30 minutes.

[0013] As a preferred solution of the method for micro-doping nano-FeO to toughen and resistant Mo2NiB2 ceramics of the present invention, wherein: the vacuum degree of the vacuum pressure sintering is less than 10 -1 Pa.

[0014] As a preferred solution of the method for preparing Mo2NiB2 ceramics toughened and corrosion-resistant by trace-doping nano-FeO according to the present invention, the pressure of the vacuum pressure sintering is 200-500 MPa.

[0015] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a toughened and corrosion-resistant Mo2NiB2 ceramic.

[0016] Beneficial effects of the present invention:

[0017] The toughness of the Mo2NiB2 ceramic prepared by the present invention is significantly improved, with the highest improvement being more than 2 times. The raw materials used in the present invention are low in price, the equipment is simple, the energy consumption is low, the time is short, and the safety is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0019] Figure 1 This is a scanning electron microscope image of the fracture morphology of the toughened Mo2NiB2 ceramic prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the embodiments of the specification.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0023] Unless otherwise specified, the raw materials used in the present invention are all commercially available.

[0024] The performance of the materials prepared in the embodiment of the present invention was tested as follows:

[0025] The fracture toughness of toughened Mo2NiB2 ceramics was measured with reference to GB / T 23806-2009.

[0026] Example 1

[0027] This embodiment provides a method for preparing toughened Mo2NiB2 ceramics, specifically:

[0028] (1) FeO powder with a purity of 99% and a particle size of 200 nm and Mo2NiB2 powder with a purity of 99.5% and a particle size of 300 μm were quickly weighed at a mass ratio of 0.02:1 and then loaded into a ball mill;

[0029] (2) Place the ball mill in a ball mill and mill the mixed powder for 5 h at a ball-to-material ratio of 10:1 and a ball mill speed of 250 rpm. Quickly fill the taken-out mixed powder into a graphite crucible;

[0030] (3) Place the graphite crucible containing the mixed powder into a plasma activated sintering furnace and perform vacuum pressure sintering at 950°C. The vacuum degree of vacuum pressure sintering is 10 -3 The vacuum pressure sintering process was performed at a heating rate of 3°C / s and kept at this temperature for 30 minutes. After sintering, the furnace was cooled to obtain FeO-toughened Mo2NiB2 ceramics.

[0031] Figure 1This is a scanning electron microscope image of the fracture morphology of the toughened Mo2NiB2 ceramic prepared in Example 1 of the present invention. As can be seen from the image, the dimple phenomenon is obvious, indicating that the toughening effect is significant.

[0032] Example 2

[0033] The difference between this embodiment and embodiment 1 is that the mass ratio of FeO powder and Mo2NiB2 powder is adjusted to 0.01:1, and the rest of the preparation process is the same as that of embodiment 1 to obtain toughened Mo2NiB2 ceramics.

[0034] Example 3

[0035] The difference between this embodiment and embodiment 1 is that the mass ratio of FeO powder and Mo2NiB2 powder is adjusted to 0.1:1, and the rest of the preparation process is the same as that of embodiment 1 to obtain toughened Mo2NiB2 ceramics.

[0036] Comparative Example 1

[0037] The difference between this embodiment and embodiment 1 is that the mass ratio of FeO powder and Mo2NiB2 powder is adjusted to 0:1, and the rest of the preparation process is the same as that of embodiment 1 to obtain toughened Mo2NiB2 ceramics.

[0038] The performance of the materials prepared in the above embodiment was tested, and the comparison results with those in Example 1 are shown in Table 1.

[0039] Table 1

[0040]

[0041] It can be seen from the above table that adjusting the mass ratio of FeO powder and Mo2NiB2 powder has a significant effect on the performance of toughened Mo2NiB2 ceramics. The reason needs further analysis and research. At present, according to the results in the above table, the best technical effect can be obtained when the mass ratio of FeO powder and Mo2NiB2 powder in the present invention is 0.02:1.

[0042] Example 4

[0043] The difference between this embodiment and embodiment 1 is that the ball milling time is adjusted to 4 hours, and the rest of the preparation process is the same as that of embodiment 1 to obtain toughened Mo2NiB2 ceramics.

[0044] Example 5

[0045] The difference between this embodiment and embodiment 1 is that the ball milling time is adjusted to 10 hours, and the rest of the preparation process is the same as that of embodiment 1 to obtain toughened Mo2NiB2 ceramics.

[0046] Example 6

[0047] The difference between this embodiment and embodiment 1 is that the ball milling time is adjusted to 20 hours, and the rest of the preparation process is the same as that of embodiment 1 to obtain toughened Mo2NiB2 ceramics.

[0048] The performance of the materials prepared in the above embodiment was tested, and the comparison results with those in Example 1 are shown in Table 2.

[0049] Table 2

[0050]

[0051] It can be seen from the above table that adjusting the ball milling time has a significant effect on the performance of toughened Mo2NiB2 ceramics. This is because extending the ball milling time is conducive to the uniform distribution of FeO. However, the change in the toughening effect is not obvious as the time is further extended. According to the results in the above table, the best technical effect can be obtained when the ball milling time is 5h in the present invention.

[0052] Example 7

[0053] The difference between this embodiment and embodiment 1 is that the sintering temperature is adjusted to 900° C., and the rest of the preparation process is the same as that of embodiment 1 to obtain toughened Mo2NiB2 ceramics.

[0054] Example 8

[0055] The difference between this embodiment and embodiment 1 is that the sintering temperature is adjusted to 1200° C., and the rest of the preparation process is the same as that of embodiment 1 to obtain toughened Mo2NiB2 ceramics.

[0056] The performance of the materials prepared in the above embodiment was tested, and the comparison results with those in Example 1 are shown in Table 1.

[0057] Table 1

[0058]

[0059] It can be seen from the above table that adjusting the sintering temperature has a significant effect on the performance of toughened Mo2NiB2 ceramics. This is because as the sintering temperature increases, the bonding ability between FeO and Mo2NiB2 is improved, which is beneficial to improving the toughness. According to the results in the above table, the best technical effect can be obtained when the sintering temperature in the present invention is 950°C.

[0060] Comparative Example 2

[0061] The difference between this comparative example and Example 1 is that the sintering temperature is adjusted to 1500° C., and the rest of the preparation process is the same as that of Example 1 to obtain toughened Mo2NiB2 ceramics.

[0062] The holes are obvious and the toughening effect is poor.

[0063] In summary, the method of using trace amounts of doped nano-FeO to toughen and resistant Mo2NiB2 ceramics has a simple process and significantly improves the toughness of Mo2NiB2 ceramics, with the highest increase being more than 2 times, and has important application prospects.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for toughening and corrosion-resistant Mo2NiB2 ceramics by trace doping with nano-FeO, characterized in that: include, The FeO powder and Mo2NiB2 powder are weighed in a mass ratio of (0.01-0.1):1 and then evenly mixed to obtain a mixed powder; the mixed powder is ball-milled and then vacuum pressure sintered; after sintering, the mixture is cooled to obtain FeO-toughened Mo2NiB2 ceramics; Wherein, the purity of the Mo2NiB2 powder is ≥99% and the particle size is ≤300μm; The sintering temperature of the vacuum pressure sintering is 900-1200°C.

2. The method for toughening and corrosion-resistant Mo2NiB2 ceramics by trace doping of nano-FeO as claimed in claim 1, characterized in that: The purity of the FeO powder is ≥98%, and the particle size is ≤200nm.

3. The method for toughening and corrosion-resistant Mo2NiB2 ceramics by trace doping of nano-FeO as claimed in claim 1, characterized in that: The ball milling process has a ball-to-material ratio of 9 to 10:1, a ball milling speed of 200 to 300 rpm, and a milling time of 4 to 20 hours.

4. The method for toughening and corrosion-resistant Mo2NiB2 ceramics by trace doping of nano-FeO as claimed in claim 1, characterized in that: The heating rate of the vacuum pressure sintering is 2-5°C / s.

5. The method for toughening and corrosion-resistant Mo2NiB2 ceramics by trace doping of nano-FeO as claimed in claim 1, characterized in that: The sintering time of the vacuum pressure sintering is 10 to 30 minutes.

6. The method for toughening and corrosion-resistant Mo2NiB2 ceramics by trace doping of nano-FeO as claimed in claim 1, characterized in that: The vacuum degree of the vacuum pressure sintering is less than 10 -1 Pa.

7. The method for toughening and corrosion-resistant Mo2NiB2 ceramics by trace doping of nano-FeO as claimed in claim 1, characterized in that: The pressure of the vacuum pressure sintering is 200-500 MPa.

8. Mo2NiB2 ceramics prepared by the method of trace-doping nano-FeO to toughen and resist corrosion of Mo2NiB2 ceramics as claimed in any one of claims 1 to 7.

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