CN111378858A - Mo-modified chromium carbide-nickel-chromium composite material and preparation method thereof - Google Patents

Mo-modified chromium carbide-nickel-chromium composite material and preparation method thereof Download PDF

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CN111378858A
CN111378858A CN202010312622.3A CN202010312622A CN111378858A CN 111378858 A CN111378858 A CN 111378858A CN 202010312622 A CN202010312622 A CN 202010312622A CN 111378858 A CN111378858 A CN 111378858A
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翟文彦
蒲博玮
孙良
王怡然
何林
董会
高义民
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Xian Shiyou University
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
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    • C22C1/055—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds using carbon
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Abstract

The invention provides a Mo modified (Cr, Mo)3C2‑(Cr,Mo)7C3-a NiCr composite and a method for preparing the same, comprising: step 1, carrying out ball milling and mixing on Cr powder, C powder, Ni powder and Mo powder; step 2, carrying out compression molding on the mixed powder to obtain an original blank; step 3, sintering the original blank body under vacuum and no pressure, wherein the vacuum degree is 0.0001-0.1Pa during sintering, the sintering temperature is 1100-1500 ℃, and Mo modified (Cr, Mo) is obtained3C2‑(Cr,Mo)7C3-a NiCr composite material. The invention prepares novel (Cr, Mo)3C2‑(Cr,Mo)7C3The main mechanical property indexes of the-NiCr composite material are good, and the mechanical properties are obviously improved.

Description

Mo-modified chromium carbide-nickel-chromium composite material and preparation method thereof
Technical Field
The invention belongs to the field of structural functional materials, and relates to a Mo-modified chromium carbide-nickel chromium composite material and a preparation method thereof.
Background
Chromium carbide-nickel composites (consisting of a ceramic hard phase chromium carbide and a metallic binder phase nickel, with the ceramic hard phase mass percentage generally controlled between 70 wt.% and 90 wt.%) have a series of excellent properties: 1) high-temperature hardness, and the Vickers Hardness (HV) of the high-temperature hard alloy is more than 2000HV at 1100 ℃; 2) the thermal expansion coefficient is obviously higher than that of other metal ceramic composite materials and is similar to that of steel, so that the material is particularly suitable for manufacturing various precise wear-resistant measuring tools, cutters and high-temperature dies; 3) the density is low, the density is only about half of that of the tungsten carbide metal ceramic composite material, and the industrial field is convenient for light-weight production; 4) the high-temperature oxidation resistance is good, no change occurs even when the sample is heated for 2 hours at 1000 ℃, and no oxide skin is generated on the surface of the polished sample after being kept for 24 hours at 1100 ℃; 5) the wear-resisting property is excellent, and because the hard chromium carbide skeleton phase is contained, the room-temperature hardness of the chromium carbide-based metal ceramic composite material is about HRA88 or above, and is equivalent to the hardness and the wear-resisting property of YG8 of a tungsten carbide metal ceramic composite material; 6) the corrosion resistance is good, and the corrosion resistance is excellent in strong acid, strong alkali, seawater, petroleum industry and other corrosion media. Therefore, the chromium carbide-nickel composite material has wide application prospect in the fields of wear-resistant materials, corrosion-resistant materials and the like.
In recent years, researchers at home and abroad use Cr3C2Cr prepared from powder and Ni powder3C2-Ni cermet Presence of Cr3C2Large particle size (about 20-30 μm), low bending strength, and the like, and the low mechanical property limits the production application.
Disclosure of Invention
The invention aims to provide Mo modified (Cr, Mo)3C2-(Cr,Mo)7C3-NiCr composite material and preparation method thereof, prepared (Cr, Mo)3C2-(Cr,Mo)7C3The mechanical property index of the-NiCr composite material is good.
The invention is realized by adopting the following technical scheme:
a preparation method of a Mo modified chromium carbide-nickel chromium composite material comprises the following steps:
step 1, carrying out ball milling and mixing on Cr powder, C powder, Ni powder and Mo powder to obtain mixed powder; wherein, the mass of the Cr powder accounts for 69.3 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the C powder accounts for 10.7 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the Ni powder accounts for 20 percent of the total mass of the Cr powder, the C powder and the Ni powder, and the mass of the Mo powder accounts for 0.5 to 1.5 percent of the total mass of the Cr powder, the C powder and the Ni powder;
step 2, carrying out compression molding on the mixed powder to obtain an original blank;
step 3, sintering the original blank body under vacuum and no pressure at the sintering temperature of 1100-1500 ℃ to obtain Mo-modified (Cr, Mo)3C2-(Cr,Mo)7C3-a NiCr composite material.
Preferably, in the step 1, a ball milling tank adopted by ball milling is an agate tank, grinding balls are agate balls, the diameter of the agate balls is 1-5mm, and the ball-to-material ratio adopted by ball milling is (5-10): 1.
Preferably, in step 1, the ball milling time is 1 to 15 hours.
Preferably, in step 1, the purity and the particle size of the Cr powder are respectively as follows: 99.9 percent and less than or equal to 20 mu m; the purity and the granularity of the C powder are respectively as follows: 99.9 percent and less than or equal to 1 mu m; the purity and the granularity of the Ni powder are respectively as follows: 99.9 percent and less than or equal to 5 mu m; the purity and the granularity of the Mo powder are respectively as follows: 99.9 percent and less than or equal to 5 mu m.
Preferably, in step 2, the pressure used for compression molding is 200-500 MPa.
Preferably, in the step 3, the sintering time is 1-4 h.
Preferably, the temperature rise rate during sintering is: 5-10 deg.c/min.
Preferably, the degree of vacuum during sintering is 0.0001 to 0.1 Pa.
The Mo modified chromium carbide-nickel chromium composite material prepared by the preparation method.
Compared with the prior art, the invention has the following beneficial technical effects:
the chromium carbide-nickel chromium composite material prepared by doping the alloy element Mo not only has Cr3C2At the same time, Cr is produced7C3Phase, and compared with chromium carbide-nickel composite material not doped with MoThe ceramic phase particle size is significantly reduced. Based on the diffusion thermodynamics theory, Mo element doping promotes the mutual diffusion phenomenon of Ni and Cr, one part of Cr atoms replaced by Ni atoms and Mo atoms is diffused into Ni to generate NiCr phase, the other part of Cr atoms increases the initial ratio of Cr to C, and Cr occurs7C3Phase change of the phase to thereby produce Cr7C3And (4) phase(s). Due to Cr7C3Ratio of mechanical properties Cr3C2The phase is better, and the final prepared (Cr, Mo) is ensured due to the reduction of the particle size of the ceramic phase3C2-(Cr,Mo)7C3The mechanical properties of the-NiCr composite material such as bending strength, hardness and the like are obviously improved. The preparation method is simple and is used for preparing high-performance (Cr, Mo)3C2-(Cr,Mo)7C3The NiCr composite material provides a new technology which is low in cost, stable in process and easy to industrialize.
Mo modified (Cr, Mo) prepared in the invention3C2-(Cr,Mo)7C3the-NiCr composite material has high density and good main mechanical property index, and is suitable for severe working conditions such as high-temperature oxidation, high-temperature abrasion and the like.
Drawings
FIG. 1 shows examples 1 to 3 (Cr, Mo)3C2-(Cr,Mo)7C3-XRD analysis results of NiCr composite and comparative materials; (a) examples 1-3 and (b) comparative example.
FIG. 2 is a composite texture map of the present invention; (a) no Mo was added, (b) 0.5 wt.% Mo was added, (c) 1.0 wt.% Mo was added and (d) 1.5 wt.% Mo was added.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The Mo of the invention is modified (Cr, Mo)3C2-(Cr,Mo)7C3-a method for preparing a NiCr composite material comprising the steps of:
step 1, selecting Cr powder, C powder, Ni powder and Mo powder as raw materials, wherein the mass of the Cr powder accounts for 69.3% of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the C powder accounts for 10.7% of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the Ni powder accounts for 20% of the total mass of the Cr powder, the C powder and the Ni powder, and the mass of the Mo powder accounts for 0.5-1.5% of the total mass of the Cr powder, the C powder and the Ni powder. The Cr powder, the C powder, the Ni powder and the Mo powder are weighed and then put into an agate ball milling tank, the milling balls are agate balls (the diameter is 1-5mm), and the ball-to-material ratio is (5-10): 1.
And 2, putting the agate ball-milling tank into a planetary ball mill, turning the ball-milling tank in an open mill for 1-15 hours, cooling the agate ball-milling tank to room temperature along with the ball-milling tank after the ball-milling is finished, opening the ball-milling tank, filling mixed powder of Cr powder, C powder, Ni powder and Mo powder into a metal mold, and performing compression molding under the pressure of 200-500 MPa.
Step 3, putting the molded blank into a graphite mold, putting the molded blank and the graphite mold into a vacuum pressureless sintering furnace together for sintering, wherein the vacuum degree is 0.0001-0.1Pa during sintering; the temperature rise speed of the sintering furnace is as follows: 5-10 ℃/min; the sintering temperature is as follows: 1100 ℃ and 1500 ℃ (the heat preservation time is 1-4h), and the sintered material is cooled along with the sintering furnace after being sintered.
The purity and the granularity of the Cr powder are respectively as follows: 99.9 percent and less than or equal to 20 mu m;
the purity and the granularity of the C powder are respectively as follows: 99.9 percent and less than or equal to 1 mu m;
the purity and the granularity of the Ni powder are respectively as follows: 99.9 percent and less than or equal to 5 mu m;
the purity and the granularity of the Mo powder are respectively as follows: 99.9 percent and less than or equal to 5 mu m.
Specific examples of the present invention are explained below:
example 1:
firstly, selecting Cr powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 20 mu m), C powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 1 mu m), Ni powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m) and Mo powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m), wherein the mass of the Cr powder accounts for 69.3 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the C powder accounts for 10.7 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the Ni powder accounts for 20 percent of the total mass of the Cr powder, the C powder and the Ni powder, and the mass of the Mo powder accounts for 0.5 percent of the total mass of the Cr powder, the C. After weighing, the mixture is put into an agate ball milling tank, and the milling balls are agate balls (the diameter is 1mm) and the ball-to-material ratio is 10: 1.
Then placing the agate ball milling tank into a planetary ball mill, turning the agate ball milling tank in the planetary ball mill, cooling the agate ball milling tank to room temperature along with the tank body after ball milling is finished for 13 hours, opening the tank body, filling ball milling powder into a metal mold, and performing compression molding under 200 MPa;
finally, the compression molding green body is put into a graphite mold and is put into a vacuum sintering furnace together for pressureless sintering, and the vacuum degree is 10 during sintering-4Pa; the temperature rise speed of the sintering furnace is as follows: 5 ℃/minute; the sintering temperature is as follows: 1300 ℃ (the heat preservation time is 1h), and the sintering furnace is cooled together after the sintering is finished.
Mo modified (Cr, Mo) prepared in this example3C2-(Cr,Mo)7C3The porosity of the-NiCr composite material is 1.11 percent, the hardness is 86.9HRA, the bending strength reaches 1210MPa, and the fracture toughness reaches 14.1 MPa.m1/2. Wherein Cr is in the ceramic phase3C2And Cr7C3The volume percentage of (A) is 3: 5.
Example 2:
firstly, selecting Cr powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 20 mu m), C powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 1 mu m), Ni powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m) and Mo powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m), wherein the mass of the Cr powder accounts for 69.3 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the C powder accounts for 10.7 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the Ni powder accounts for 20 percent of the total mass of the Cr powder, the C powder and the Ni powder, and the mass of the Mo powder accounts for 1.0 percent of the total mass of the Cr powder, the C. After weighing, the mixture is put into an agate ball milling tank, and the milling balls are agate balls (the diameter is 1mm) and the ball-to-material ratio is 10: 1.
Then placing the agate ball milling tank into a planetary ball mill, turning the agate ball milling tank in the planetary ball mill, cooling the agate ball milling tank to room temperature along with the tank body after ball milling is finished for 13 hours, opening the tank body, filling ball milling powder into a metal mold, and performing compression molding under 200 MPa;
finally, the compression molding green body is put into a graphite mold and is put into a vacuum sintering furnace together for pressureless sintering, and the vacuum degree is 10 during sintering-4Pa; the temperature rise speed of the sintering furnace is as follows: 5 ℃/minute; the sintering temperature is as follows: 1300 deg.C (when keeping warm)The time is 1h), and the sintered material is cooled along with the sintering furnace after sintering.
Mo modified (Cr, Mo) prepared in this example3C2-(Cr,Mo)7C3The porosity of the-NiCr composite material is 0.92%, the hardness is 88.5HRA, the bending strength reaches 1290MPa, and the fracture toughness reaches 15.6 MPa.m1/2. Wherein Cr is in the ceramic phase3C2And Cr7C3The volume percentage of (A) is 1: 3.
Example 3:
firstly, selecting Cr powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 20 mu m), C powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 1 mu m), Ni powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m) and Mo powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m), wherein the mass of the Cr powder accounts for 69.3 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the C powder accounts for 10.7 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the Ni powder accounts for 20 percent of the total mass of the Cr powder, the C powder and the Ni powder, and the mass of the Mo powder accounts for 1.5 percent of the total mass of the Cr powder, the C. After weighing, the mixture is put into an agate ball milling tank, and the milling balls are agate balls (the diameter is 1mm) and the ball-to-material ratio is 10: 1.
Then placing the agate ball milling tank into a planetary ball mill, turning the agate ball milling tank in the planetary ball mill, cooling the agate ball milling tank to room temperature along with the tank body after ball milling is finished for 13 hours, opening the tank body, filling ball milling powder into a metal mold, and performing compression molding under 200 MPa;
finally, the compression molding green body is put into a graphite mold and is put into a vacuum sintering furnace together for pressureless sintering, and the vacuum degree is 10 during sintering-4Pa; the temperature rise speed of the sintering furnace is as follows: 5 ℃/minute; the sintering temperature is as follows: 1300 ℃ (the heat preservation time is 1h), and the sintering furnace is cooled together after the sintering is finished.
Mo modified (Cr, Mo) prepared in this example3C2-(Cr,Mo)7C3The porosity of the-NiCr composite material is 0.88%, the hardness is 88.8HRA, the bending strength reaches 1300MPa, and the fracture toughness reaches 15.8 MPa.m1/2. Wherein Cr is in the ceramic phase3C2And Cr7C3The volume percentage of (A) is 1: 4.
Example 4:
firstly, selecting Cr powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 20 mu m), C powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 1 mu m), Ni powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m) and Mo powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m), wherein the mass of the Cr powder accounts for 69.3 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the C powder accounts for 10.7 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the Ni powder accounts for 20 percent of the total mass of the Cr powder, the C powder and the Ni powder, and the mass of the Mo powder accounts for 1.5 percent of the total mass of the Cr powder, the C. After weighing, the mixture is put into an agate ball milling tank, and the milling balls are agate balls (the diameter is 1mm) and the ball-to-material ratio is 5: 1.
Then placing the agate ball milling tank into a planetary ball mill, turning the agate ball milling tank in the planetary ball mill, cooling the agate ball milling tank to room temperature along with the tank body after ball milling is completed for 1 hour, opening the tank body, filling ball milling powder into a metal mold, and performing compression molding under 200 MPa;
finally, the compression molding green body is placed into a graphite mold and is placed into a vacuum sintering furnace together for pressureless sintering, and the vacuum degree is 0.1Pa during sintering; the temperature rise speed of the sintering furnace is as follows: 5 ℃/minute; the sintering temperature is as follows: 1100 ℃ (the heat preservation time is 1h), and the sintered product is cooled along with the sintering furnace after being sintered.
Mo modified (Cr, Mo) prepared in this example3C2-(Cr,Mo)7C3The porosity of the-NiCr composite material is 3.46 percent, the hardness is 81.2HRA, the bending strength reaches 720MPa, and the fracture toughness reaches 7.4 MPa.m1/2. Wherein Cr is in the ceramic phase3C2And Cr7C3The volume percentage of (A) is 1: 5.
Example 5:
firstly, selecting Cr powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 20 mu m), C powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 1 mu m), Ni powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m) and Mo powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m), wherein the mass of the Cr powder accounts for 69.3 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the C powder accounts for 10.7 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the Ni powder accounts for 20 percent of the total mass of the Cr powder, the C powder and the Ni powder, and the mass of the Mo powder accounts for 1.5 percent of the total mass of the Cr powder, the C. After weighing, the mixture is put into an agate ball milling tank, and the milling balls are agate balls (the diameter is 5mm) with the ball-to-material ratio of 10: 1.
Then placing the agate ball milling tank into a planetary ball mill, starting up the planetary ball mill to rotate, cooling the agate ball milling tank to room temperature along with the tank body after ball milling is completed for 15 hours, opening the tank body, filling ball milling powder into a metal mold, and performing compression molding under 500 MPa;
finally, the compression molding green body is put into a graphite mold and is put into a vacuum sintering furnace together for pressureless sintering, and the vacuum degree is 10 during sintering-4Pa; the temperature rise speed of the sintering furnace is as follows: 10 ℃/minute; the sintering temperature is as follows: 1500 ℃ and 4 hours of heat preservation time, and the mixture is cooled along with a sintering furnace after sintering.
Mo modified (Cr, Mo) prepared in this example3C2-(Cr,Mo)7C3The porosity of the-NiCr composite material is 1.02%, the hardness is 86.5HRA, the bending strength reaches 1120MPa, and the fracture toughness reaches 12.3 MPa.m1/2. Wherein Cr is in the ceramic phase3C2And Cr7C3The volume percentage of (2: 5).
Example 6:
firstly, selecting Cr powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 20 mu m), C powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 1 mu m), Ni powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m) and Mo powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m), wherein the mass of the Cr powder accounts for 69.3 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the C powder accounts for 10.7 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the Ni powder accounts for 20 percent of the total mass of the Cr powder, the C powder and the Ni powder, and the mass of the Mo powder accounts for 1.5 percent of the total mass of the Cr powder, the C. After weighing, the mixture is put into an agate ball milling tank, and the milling balls are agate balls (the diameter is 3mm) and the ball-to-material ratio is 8: 1.
Then placing the agate ball milling tank into a planetary ball mill, starting up the planetary ball mill to rotate, cooling the agate ball milling tank to room temperature along with the tank body after ball milling is completed for 10 hours, opening the tank body, filling ball milling powder into a metal mold, and performing compression molding under 300 MPa;
finally, the compression molding green body is put into a graphite mold and is put into a vacuum sintering furnace together for pressureless sintering, and the vacuum degree is 10 during sintering-3Pa; sinteringThe temperature rise rate of the furnace was: 8 ℃/minute; the sintering temperature is as follows: 1300 ℃ (the heat preservation time is 2h), and the sintering furnace is cooled together after the sintering is finished.
Mo modified (Cr, Mo) prepared in this example3C2-(Cr,Mo)7C3The porosity of the-NiCr composite material is 0.91%, the hardness is 88.2HRA, the bending strength reaches 1270MPa, and the fracture toughness reaches 15.4 MPa.m1/2. Wherein Cr is in the ceramic phase3C2And Cr7C3The volume percentage of (A) is 3: 8.
Comparative example:
firstly, selecting Cr powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 20 mu m), C powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 1 mu m) and Ni powder (the purity and the granularity are respectively 99.9 percent and less than or equal to 5 mu m), wherein the mass of the Cr powder accounts for 69.3 percent of the total mass of the Cr powder, the C powder accounts for 10.7 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the Ni powder accounts for 20 percent of the total mass of the Cr powder, the C powder and the Ni powder, weighing the materials, then putting the materials into an agate ball milling tank, wherein the milling balls are agate balls (the diameter is 1mm), and the ball-to-material ratio is 10: 1.
Then placing the agate ball milling tank into a planetary ball mill, turning the agate ball milling tank in the planetary ball mill, cooling the agate ball milling tank to room temperature along with the tank body after ball milling is finished for 13 hours, opening the tank body, filling ball milling powder into a metal mold, and performing compression molding under 200 MPa;
finally, the compression molding green body is put into a graphite mold and is put into a vacuum sintering furnace together for pressureless sintering, and the vacuum degree is 10 during sintering-4Pa; the temperature rise speed of the sintering furnace is as follows: 5 ℃/minute; the sintering temperature is as follows: 1300 ℃ (the heat preservation time is 1h), and the sintering furnace is cooled together after the sintering is finished.
Cr prepared by the comparative example without Mo addition3C2The porosity of the-Ni composite material is 1.44%, the hardness is 85.4HRA, the bending strength reaches 1040MPa, and the fracture toughness reaches 13.2 MPa.m1/2. Wherein the ceramic phase is Cr3C2Does not contain Cr7C3。
The XRD patterns of the materials prepared in examples 1-3 and comparative example are shown in FIG. 1, and the peaks of the XRD patterns can be seen, and the materials prepared in examples 1-3 can be obtained by adding MoThe material contains (Cr, Mo)3C2、(Cr,Mo)7C3And NiCr, while the comparative example is made of a material prepared without adding Mo and only Cr3C2And a Ni two phase.
Comparative example Cr prepared without Mo addition3C2-Ni composite material, which is sintered by using Cr powder, C powder and Ni powder, under the conditions of ball milling time of 13h, sintering temperature of 1300 ℃ and heat preservation time of 1h, the sintered structure is shown as figure 2(a), and the structure does not contain Cr7C3The gray part is Cr3C2The white portion is Ni. In the invention, in the embodiments 1-3, under the conditions of ball milling and mixing for 13h, compression molding pressure of 200MPa, sintering temperature of 1300 ℃, heat preservation time of 1h and the like, Cr powder, C powder, Ni powder and Mo powder with different contents are adopted to prepare novel Mo modified (Cr, Mo)3C2-(Cr,Mo)7C3NiCr composite material, as shown in FIGS. 2 (b), (c) and (d), black part being (Cr, Mo)3C2The gray part is (Cr, Mo)7C3The white portion is NiCr. As can be seen by comparison, the grain size of the ceramic phase obtained after addition of Mo in examples 1-3 is significantly reduced compared to the comparative example. And Cr3C2In contrast, newly formed Cr7C3Has more excellent hardness and strength, and the particle size of the ceramic phase is reduced, so (Cr, Mo)3C2-(Cr,Mo)7C3The mechanical property of the-NiCr composite material is more excellent, and the main mechanical property index is good, as shown in Table 1.
TABLE 1 comparison of mechanical properties of comparative and examples
Figure BDA0002458425390000101
Mo modified (Cr, Mo) compared with comparative example3C2-(Cr,Mo)7C3The grain size of the ceramic phase in the-NiCr composite material is obviously reduced, and the-NiCr composite material and the Cr3C2In contrast, newly formed Cr7C3Has more excellent hardness and strength, so (Cr, Mo)3C2-(Cr,Mo)7C3The mechanical properties of the-NiCr composite material are obviously improved, the production period of the invention is short, and the process is simpler.
Meanwhile, the invention improves the structure composition of the composite material by adding Mo powder with different contents, and controls the Cr phase of the ceramic by regulating and controlling the content of the added Mo powder3C2And Cr7C3The ratio of the ceramic particles to the ceramic particles is reduced effectively, and the mechanical property is improved. As can be seen from comparative examples 1 to 3, Cr in the ceramic phase increases with the addition amount of Mo7C3The ratio of the Mo to the Ni is increased, the mechanical property is also increased, and the grain size of the ceramic phase is obviously reduced compared with that without the Mo.

Claims (9)

1. A preparation method of a Mo modified chromium carbide-nickel chromium composite material is characterized by comprising the following steps:
step 1, carrying out ball milling and mixing on Cr powder, C powder, Ni powder and Mo powder to obtain mixed powder; wherein, the mass of the Cr powder accounts for 69.3 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the C powder accounts for 10.7 percent of the total mass of the Cr powder, the C powder and the Ni powder, the mass of the Ni powder accounts for 20 percent of the total mass of the Cr powder, the C powder and the Ni powder, and the mass of the Mo powder accounts for 0.5 to 1.5 percent of the total mass of the Cr powder, the C powder and the Ni powder;
step 2, carrying out compression molding on the mixed powder to obtain an original blank;
step 3, sintering the original blank body under vacuum and no pressure at the sintering temperature of 1100-1500 ℃ to obtain Mo-modified (Cr, Mo)3C2-(Cr,Mo)7C3-a NiCr composite material.
2. The preparation method of the Mo-modified chromium carbide-nickel chromium composite material as claimed in claim 1, wherein in the step 1, the ball milling pot adopted by the ball milling is an agate pot, the milling balls are agate balls, the diameters of the agate balls are 1-5mm, and the ball-to-material ratios adopted by the ball milling are respectively (5-10): 1.
3. The method for preparing a Mo-modified chromium carbide-nickel chromium composite material according to claim 1, wherein the ball milling time in step 1 is 1 to 15 hours.
4. The preparation method of the Mo-modified chromium carbide-nickel chromium composite material as claimed in claim 1, wherein in step 1, the purity and granularity of Cr powder are respectively as follows: 99.9 percent and less than or equal to 20 mu m; the purity and the granularity of the C powder are respectively as follows: 99.9 percent and less than or equal to 1 mu m; the purity and the granularity of the Ni powder are respectively as follows: 99.9 percent and less than or equal to 5 mu m; the purity and the granularity of the Mo powder are respectively as follows: 99.9 percent and less than or equal to 5 mu m.
5. The method for preparing the Mo-modified chromium carbide-nickel chromium composite material as claimed in claim 1, wherein the pressure for compression molding in step 2 is 200-500 MPa.
6. The method for preparing the Mo-modified chromium carbide-nickel chromium composite material according to claim 1, wherein in the step 3, the sintering time is 1-4 h.
7. The method for preparing the Mo-modified chromium carbide-nickel chromium composite material according to claim 1, wherein the temperature rise rate during sintering is as follows: 5-10 deg.c/min.
8. The method of preparing a Mo-modified chromium carbide-nickel chromium composite according to claim 1, wherein the degree of vacuum at sintering is 0.0001 to 0.1 Pa.
9. The Mo-modified chromium carbide-nickel chromium composite material obtained by the preparation method of any one of claims 1 to 8.
CN202010312622.3A 2020-04-20 2020-04-20 Mo-modified chromium carbide-nickel-chromium composite material and preparation method thereof Pending CN111378858A (en)

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