WO2022074904A1 - Éléments de machine de pulvérisation, d'agitation, de mélange et de malaxage - Google Patents

Éléments de machine de pulvérisation, d'agitation, de mélange et de malaxage Download PDF

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WO2022074904A1
WO2022074904A1 PCT/JP2021/027829 JP2021027829W WO2022074904A1 WO 2022074904 A1 WO2022074904 A1 WO 2022074904A1 JP 2021027829 W JP2021027829 W JP 2021027829W WO 2022074904 A1 WO2022074904 A1 WO 2022074904A1
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phase
mixing
stirring
cermet
kneading machine
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PCT/JP2021/027829
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English (en)
Japanese (ja)
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克弥 真島
史哉 黒木
修司 上野
敬章 田中
泰範 皆川
景太 渡邉
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日本タングステン株式会社
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Application filed by 日本タングステン株式会社 filed Critical 日本タングステン株式会社
Priority to KR1020227046335A priority Critical patent/KR20230019161A/ko
Priority to CN202180044645.3A priority patent/CN115943222A/zh
Priority to DE112021005360.4T priority patent/DE112021005360T5/de
Publication of WO2022074904A1 publication Critical patent/WO2022074904A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/04—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbonitrides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/10—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on titanium carbide
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the present invention relates to a crushing / stirring / mixing / kneading machine member made of a cermet having excellent impact resistance and wear resistance.
  • Patent Document 1 the pores and the bound phase pool are eliminated by a three-step sintering method of temporary sintering in a reduced pressure nitrogen atmosphere, HIP treatment, and final heat treatment in a reduced pressure nitrogen atmosphere, and the TiN / TiC ratio is obtained.
  • a method for producing a cermet having a high strength is disclosed even from 3/7 to 7/3.
  • Such carbonitride-based cermets are used in cutting tool applications such as milling.
  • the microstructure is rich in WC with excellent toughness around the central core, as opposed to the conventional cermet which has a two-phase structure of a core composed of a hard phase and a rim which is a peripheral structure having toughness. Cermets with higher toughness by forming the third phase are disclosed. Compared with conventional cermets, this cermet improves bending strength and breaking toughness without lowering wear resistance and hardness, and is a part that requires wear resistance and toughness as well as a tool for machine tools. , Can be widely applied as a member.
  • the cermet has improved impact resistance, wear resistance, and heat-resistant plastic deformation by increasing the amount of nitride, controlling the hard phase particle size to relatively coarse particles, and further strengthening the bonded phase.
  • the problem of shortening the life due to defects caused by thermal cracks has been solved in cutting tools to which a severe thermal shock is intermittently applied.
  • TiC is 5 to 50%, one or more of Mo 2 C, TaC, VC, Cr 3 C 2 , NbC, ZrC, and HfC is 1 to 25%, and Ni and Co are combined.
  • a cermet for a hot guide roller containing 5 to 40% of the above-mentioned TiC and having an average particle size of TiC of 1.5 to 15 ⁇ m and a WC particle size of 3 to 15 ⁇ m.
  • the coarse hard particles can suppress the growth of surface cracks, which is the biggest problem of hot rolling, and improve the life of the hot guide roller.
  • Patent Document 5 discloses that by controlling the lattice constant of the bonded phase containing Ni and Co as main components to 3.545 ⁇ or less, the heat crack resistance is improved and the life of the high-speed cutting tool is improved. There is.
  • Nitride steel is mostly used as a member for crushing, stirring, mixing, and kneading machines, but alloy tool steel is used for applications that require more wear resistance, and super hard alloy is used for harsher usage conditions. Is known to be suitable.
  • Patent Document 6 describes kneading having a complicated shape by sintering and joining a plurality of disk components made of cemented carbide, which has higher wear resistance than conventional alloy tool steel, by discharge plasma sintering.
  • the manufacture of a kneading disc, which facilitates the polishing and cutting of the disc and has excellent wear resistance, is disclosed.
  • Patent Document 7 by pressure-sintering a cemented carbide split body in the axial direction, even an elongated screw or cylinder can be configured without deformation.
  • a cemented carbide molding member that can be used continuously is disclosed.
  • Japanese Unexamined Patent Publication No. 61-003852 Japanese Unexamined Patent Publication No. 62-196352 Japanese Unexamined Patent Publication No. 63-109139 Japanese Unexamined Patent Publication No. 2-66135 Japanese Unexamined Patent Publication No. 7-112313 Japanese Unexamined Patent Publication No. 11-10709 Japanese Unexamined Patent Publication No. 2011-88410
  • Patent Document 1 When the cermet disclosed in Patent Document 1 is applied to a crushing / stirring / mixing / kneading machine member, the metal phase is relatively small, so that the impact absorption due to elastic deformation is insufficient and the toughness of the material itself is low. Therefore, there is a risk of destruction due to the impact of contact between the members in operation.
  • the cermet disclosed in Patent Document 3 is intended for application to cutting tools, has a small amount of metal phase, and has single particles of WC and Mo 2C in the metal phase. Insufficient toughness and impact resistance for application as a kneader member, it cannot be used.
  • Patent Document 5 Since the cermet disclosed in Patent Document 5 is premised on application to a cutting tool, it has a small amount of metal phase and lacks impact resistance and toughness. Not suitable for use in.
  • the kneading disc and the molding member disclosed in Patent Document 6 and Patent Document 7 are made of cemented carbide having high wear resistance, it is possible to improve the life of the member.
  • the conventional crushing / stirring / mixing / kneading machine is designed on the premise that the member made of steel material is mounted, and the member made of cemented carbide increases the load on the drive device side due to its high specific gravity and rotates. There is an unsolved problem that it is not suitable as a replacement application from steel material members due to the deflection of the shaft.
  • the present invention has been made to solve the above problems, and provides a crushing / stirring / mixing / kneading machine member which is lightweight, has excellent impact resistance and wear resistance, and has magnetism. An object is to extend the life of these members.
  • the mass ratio of each element is Ti: 20-45% Mo: 5 to 35% W: 6-30% C: 5 to 15% Co: 10-50% Co and Ni total over 25-50%
  • a powder arbitrarily selected from Ti or Ti compound, Mo or Mo compound, W or W compound, Co or Co compound, Ni or Ni compound and carbon is used as a raw material, and they are mixed wet or dry. Then, the step of obtaining the mixed powder, the step of press-molding the mixed powder at a pressure of 50 to 300 MPa to obtain a pressed compound, the pressed compound at 1300 to 1700 ° C., vacuum, reduction, inert gas, hydrogen or nitrogen.
  • the cermet obtained in the present invention which has magnetism, is lightweight, and has significantly improved wear resistance and impact resistance, can prolong the life of crushing, stirring, mixing, and kneading machine members that are severely worn. It became.
  • Specific examples of crushing / stirring / mixing / kneading machine members include screw elements and barrels for twin-screw extruders, crushing pins for pin mills, paddles for mixing and stirring machines, and powder processing equipment members such as bead mills. It can be suitably used.
  • the schematic diagram of the cross-sectional structure of the cermet used for the crushing / stirring / mixing / kneading machine member of this invention The schematic diagram of the cross-sectional structure of the cermet which has the phase which contains a lot of Mo and W relatively in the rim phase used for the pulverization / stirring / mixing / kneading machine member of this invention. SEM observation image of cermet used for crushing / stirring / mixing / kneading machine member of Example 1.
  • the crushing / stirring / mixing / kneading machine member of the present invention can be carried out with the following contents.
  • the mass ratio for each element is Ti: 20-45% Mo: 5 to 35% W: 6-30% C: 5 to 15% Co: 10-50% Co and Ni total over 25-50%
  • the raw material is a powder arbitrarily selected from Ti or Ti compound, Mo or Mo compound, W or W compound, Co or Co compound, Ni or Ni compound and carbon.
  • the Ti compound includes carbides such as TiC, TiN, TiCN, (Ti, Mo) (C, N), (Ti, W) (C, N), nitrides, carbonitrides, and composite carbonitrides. It does not matter which form is used. The same applies to Mo, W, Co, and Ni.
  • cermet has three phases, a core phase, a rim phase, and a metal phase, and the specific design of each phase will be described below. In the following description, the mass ratios for each element are those at the raw material stage.
  • N 7: 3 to 10: 0.
  • Mo is mixed in the range of 5 to 35% and W is mixed in the range of 6 to 30%.
  • the wettability between TiCN forming the core phase and Co and Ni forming the metal phase is poor, but the rim phase produced by adding Mo 2 C and WC is a hard phase consisting of a core phase and a rim phase. Wetness can be improved.
  • the sinterability of the material is improved, and the mechanical properties can be improved.
  • the wear resistance can be further improved. This is because the hard phase composed of the core phase and the rim phase is solid-solved and strengthened by W atoms, and the hard phase is less likely to be destroyed during abrasive wear.
  • Mo and W are combined to be 35% or less, the alloy of W and Co, Mo and Co, or W and Mo and Co is not formed, and the impact resistance is further improved.
  • Co and Ni are more than 25 to 50% in total. If the amount of metal is less than this range, the impact resistance becomes insufficient. If the amount is large, the wear resistance is lowered, and the crushing / stirring / mixing / kneading machine member is severely worn. Co is 10 to 50%.
  • Co which has better mechanical properties (hardness, wear resistance) than Ni, in this range, it is possible to improve the mechanical properties of crushing, stirring, mixing, and kneading machine members and extend their life. can.
  • a cermet containing 10% or more of Co has sufficient magnetism required for magnetic separation. Magnetic separation is used in a crushing / stirring / mixing / kneading machine device when detecting foreign matter in a material by chipping a member or the like.
  • the crushing / stirring / mixing / kneading machine member of the present invention can be manufactured by the following manufacturing method as an example.
  • the following steps (steps) are included. That is, the mass ratio of each element is Ti: 20-45% Mo: 5 to 35% W: 6-30% C: 5 to 15% Co: 10-50% Co and Ni total over 25-50%
  • a powder arbitrarily selected from Ti or Ti compound, Mo or Mo compound, W or W compound, Co or Co compound, Ni or Ni compound and carbon is used as a raw material, and they are mixed wet or dry.
  • the steps to get the mixed powder The step of press-molding the mixed powder at a pressure of 50 to 300 MPa to obtain a pressed body, The step of sintering the pressed body at 1300 to 1700 ° C. under any atmosphere of vacuum, reduction, inert gas, hydrogen or nitrogen.
  • a volatile solvent such as ethanol is used as a solvent, and the slurry is dried by vacuum static drying, spray drying, or the like.
  • particle size before sintering is such that the average particle size of the hard phase after sintering is less than 3 ⁇ m. It should be fine enough.
  • the particle size before sintering may be 2.0 ⁇ m or less, preferably 1.5 ⁇ m or less, more preferably 1.0 ⁇ m or less, and further preferably 0.6 ⁇ m or less.
  • the requirement that the average particle size of the hard phase after sintering is less than 3 ⁇ m can be easily satisfied. When it is 1.0 ⁇ m or less, the average particle size of the hard phase after sintering becomes smaller and the wear resistance is improved.
  • the obtained fine powder is mixed with a resin component to be a molding binder to perform granulation. Spray drying may be used for granulation.
  • the granulated powder is press-molded at 50 to 300 MPa by a die press or a hydrostatic press. After molding, intermediate processing may be added if necessary.
  • the main sintering is performed in a vacuum or gas atmosphere at 1300 to 1700 ° C.
  • a degreasing / temporary sintering step may be performed, and after degreasing and after the temporary sintering, intermediate processing may be performed at each stage as needed.
  • the degreasing and temporary sintering steps may be continuously performed, and the degreasing and temporary sintering steps and the main sintering may be continuously performed.
  • degreasing and temporary sintering are performed, they are performed in a vacuum or gas atmosphere at 600 to 1000 ° C. Further, hot hydraulic pressing can be performed if necessary.
  • the final shape is finished by machining or electric processing to obtain the desired crushing / stirring / mixing / kneading machine member.
  • the cermet used in the present invention is confirmed by cross-sectional observation by SEM.
  • the cross-sectional structure 1 is schematically shown in FIG. 1, the cermet exists so as to cover the core phase 2 containing TiCN as a main component and the periphery of the core phase 2 (Ti, Mo, W).
  • It has three phases of a rim phase 3 containing (C, N) as a main component and a metal phase 4, and the average particle size of the hard phase composed of the core phase and the rim phase in cross-sectional structure observation is less than 3 ⁇ m.
  • the cermet does not contain the WC phase and the Mo 2C phase.
  • a WC phase and a Mo 2C phase they are present in the metal phase in particle shapes having different brightness in addition to the core phase and the rim phase in SEM (scanning electron microscope) observation. If it cannot be determined, perform analysis by EPMA (electron probe microanalyzer), EDX (energy dispersive X-ray analysis), and XRD (X-ray diffraction) to comprehensively determine the presence or absence of the WC phase and Mo 2C phase. do. Even when observed irregularly, there are 1 or less particles of 1 ⁇ m or more and 5 or less particles of 0.3 ⁇ m or more in the observation field of 10,000 times.
  • the WC phase and the Mo 2C phase cannot be observed by SEM observation means that one or less particles of 1 ⁇ m or more are contained in the above-mentioned 10,000-fold observation field of view, which is also 0.3 ⁇ m. The case where the number of the above particles is 5 or less is also included. With the above configuration, a material with high impact resistance and wear resistance can be obtained.
  • the cermet has the following characteristics.
  • the core phase is a hard phase containing TiCN as a main component and has high hardness.
  • the rim phase exists so as to cover the circumference of the core phase, and is mainly composed of (Ti , Mo, W) (C, N). As shown in FIG. 2, the rim phase may have two phases, a phase having a relatively large amount of Mo component and a relatively large amount of W component, and a phase having a relatively large amount of Ti component. In the case of two phases, the hardness of the rim phase is improved and the wear resistance is further improved.
  • the average particle size of the hard phase composed of the core phase and the rim phase is less than 3 ⁇ m.
  • the average particle size can be calculated from the following Fulman's formula (Equation 1) by observing the cross-sectional structure of the cermet by SEM.
  • Equation 1 dm is the average particle size
  • ⁇ is the pi
  • NL is the number of particles per unit length hit by an arbitrary straight line on the cross-sectional structure
  • NS is within an arbitrary unit area.
  • Equation 2 n L represents the number of particles hit by an arbitrary straight line on the cross-sectional structure, L represents the length of an arbitrary straight line on the cross-sectional structure, and represents (Equation 3).
  • N S represents the number of particles contained in an arbitrary measurement area
  • S represents the area of an arbitrary measurement area.
  • the average particle size of the hard phase consisting of the core phase and the rim phase less than 3 ⁇ m, the mechanical properties and impact resistance are improved. Hard to destroy when joined.
  • the average particle size of the hard phase is 1.5 ⁇ m or less, the hardness is further improved and the wear resistance is also improved.
  • the average particle size of the hard phase is 3 ⁇ m or more, the unit of particle shedding during elastic wear becomes large, and the wear resistance is remarkably lowered.
  • the crushing / stirring / mixing / kneading machine member according to the present embodiment has a specific gravity of 9 or less.
  • the crushing / stirring / mixing / kneading machine has been designed on the premise of mounting a member made of steel material, so if the specific gravity of the member exceeds 9, the rotating shaft will bend and the drive unit will be affected. It may cause an increase in load.
  • the specific gravity is 8 or less, it can be treated in the same manner as a steel material, and when the specific gravity is 7.5 or less, it is lighter than the steel material, and the degree of freedom in device design can be increased.
  • the cermet having the above characteristics has the same high wear resistance and impact resistance as the cemented carbide, but the specific gravity is the same as that of the steel material, and further has magnetism.
  • Example 1 of Table 1 the raw material powders shown in Example 1 of Table 1 were pulverized and mixed by an attritor or a ball mill using ethanol as a solvent.
  • the obtained slurry was dried in a vacuum, mixed with paraffin as a binder, and then pressed to prepare a pressed body.
  • This pressed body is temporarily sintered at 800 ° C. in an atmospheric pressure hydrogen atmosphere, and further subjected to main sintering at 1400 ° C. in a vacuum atmosphere, whereby the cermet used for the crushing / stirring / mixing / kneading machine member of the present invention.
  • Got The cermet obtained in Example 1 had an average particle size of 1.12 ⁇ m calculated by the above-mentioned Fulman's formula.
  • Example 2 Examples and Comparative Examples after Example 2 were sintered at the lowest temperature at which the highest density was obtained in the range of 1300 to 1500 ° C. Other conditions are the same as in Example 1. Further, in all the examples and comparative examples except Comparative Example 6, the average particle size of the hard phase composed of the core phase and the rim phase was less than 1.5 ⁇ m. Furthermore, when the constituents of the cermet cross-sectional structure were observed by SEM observation, the presence of the Mo 2C phase and the WC phase could not be confirmed in all the examples. Further, in all the examples, a phase having a relatively large amount of Mo component and W component was present in the rim phase.
  • the elemental composition ratio of the entire cermet structure had a large deviation from the raw material composition, and the coefficient of determination of the raw material composition and the component ratio of the cermet after sintering was low, so that it could not be quantified accurately.
  • Table 3 shows the results of quantitative analysis by EPMA and EDX for the cermet of Example 1, but the deviation from the raw material composition can be confirmed. The reason for this is considered to be the change in the lattice state due to the formation of solid solutions between the constituent elements.
  • Non-Patent Document 1 above it is known that it is difficult to quantify the alloy composition of a cermet material even in past studies, and accurate quantification is difficult. Thus, in the present invention, it is impossible or approximately impractical to directly identify the object by its structure or properties, and the present invention has so-called "impossible / impractical circumstances". exist.
  • Table 4 shows the characteristics of cermets in Examples and Comparative Examples of the present invention.
  • the specific gravity was suppressed to 9 or less, which was the target, and the wear resistance also exceeded that of cemented carbide (JIS classification: V40 equivalent material), and showed excellent characteristics.
  • the impact resistance has achieved 6J / cm 2 or more, which was difficult to achieve with conventional cermets.
  • Examples 2 and 6 showed particularly high wear resistance as compared with Example 1.
  • the amount of Mo added was relatively large, and the hardness was improved by co-adding W, and high wear resistance was exhibited even though the amount of metal was the same as that of Example 1.
  • the wear resistance exceeded 200% as compared with the cemented carbide (JIS classification: V40 equivalent material). This is an example in which extremely high wear resistance is exhibited by minimizing the amount of metal.
  • Comparative Example 1 the amount of Mo added was larger than that of the present invention, and the wear resistance showed a very high value. However, since the Charpy impact value is low and there is a risk of breakage, it cannot be used as a member for a crushing / stirring / mixing / kneading machine. In Comparative Example 2, since the amount of W added was excessive, a WC phase was formed, and the wear resistance was significantly reduced. In Comparative Example 3 and Comparative Example 7, only Ni was used as the metal phase. This sample showed low values in hardness, wear resistance, and magnetism because the metal phase was only Ni, although the amounts of Mo, W, and the metal phase were within the range. It can be said that the addition of Co is indispensable for the development of magnetism.
  • Comparative Example 5 When the amount of Mo and W added was small as in Comparative Example 4, the wear resistance showed a low value.
  • the amount of metal phase (total of Co and Ni) is 24%, which is lower than the lower limit of the present invention. Similar to the general cermet used mainly for tools, it has high wear resistance, but its fracture toughness, bending force, and Charpy impact value are low.
  • Comparative Example 6 is a sample prepared with the same raw material compounding composition as that of Example 1 without pulverization during mixing. After sintering, the average particle size of the hard phase composed of the core phase and the rim phase exceeded 3 ⁇ m, so that the hardness and impact resistance were lowered.
  • FIG. 3 shows an SEM observation image of the cermet of Example 1.
  • the darkest part is the core phase
  • the next darkest part is the rim phase
  • the lightest part is the metal phase.

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  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

La présente invention concerne des éléments de machine de pulvérisation, d'agitation, de mélange et de malaxage qui ont chacun un poids réduit ainsi qu'une résistance aux chocs et une résistance à l'usure excellentes, qui possèdent en outre des propriétés magnétiques et qui ont une durée de vie plus longue. En particulier, la présente invention concerne des éléments de machine de pulvérisation, d'agitation, de mélange et de malaxage qui comprennent chacun un cermet qui est obtenu en associant des matières premières de telle sorte que les rapports massiques des éléments sont de 20 à 45 % de Ti, de 5 à 35 % de Mo, de 6 à 30 % de W, de 5 à 15 % de C et de 10 à 50 % de Co, le total du Co et du Ni étant supérieur à 25 % mais inférieur ou égal à 50 %, en mélangeant les matières premières pour obtenir une poudre mélangée, en moulant par compression la poudre mélangée pour obtenir un corps comprimé et en frittant le corps comprimé. Ce cermet comporte trois phases, qui sont une phase de noyau 2 contenant du TiCN en tant que constituant principal, une phase de bordure 3 qui est présente de manière à recouvrir la périphérie de la phase de noyau et qui contient (Ti, Mo,W) (C, N) en tant que constituant principal, et une phase métallique 4. La taille moyenne des particules d'une phase dure constituée de la phase de noyau et de la phase de bordure est inférieure à 3 µm telle qu'observée dans une structure en coupe transversale, et une phase WC ou une phase Mo2C ne peut pas être observée au MEB.
PCT/JP2021/027829 2020-10-09 2021-07-28 Éléments de machine de pulvérisation, d'agitation, de mélange et de malaxage WO2022074904A1 (fr)

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KR1020227046335A KR20230019161A (ko) 2020-10-09 2021-07-28 분쇄·교반·혼합·혼련기 부재
CN202180044645.3A CN115943222A (zh) 2020-10-09 2021-07-28 粉碎、搅拌、混合、混炼机构件
DE112021005360.4T DE112021005360T5 (de) 2020-10-09 2021-07-28 Pulverisier-/rühr-/misch-/knetmaschinenkomponente

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DE112021005360T5 (de) 2023-07-20

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