TiC-based cermet material and preparation method thereof

Abstract

The present invention discloses a TiC-based metal ceramic material and a preparation method thereof, belonging to the technical field of metal ceramic preparation. The preparation method of the TiC-based metal ceramic material comprises the following steps: a. weighing ingredients; b. vacuum ball milling mixing; c. vacuum drying; d. pressing; e. vacuum sintering. The present invention mainly uses TiC as the matrix material, and by changing the different ratios of WC, Mo, Co, and Ni, a new type of TiC-based metal ceramic material is prepared, and (Ti, W, Mo) C micron-level ceramic phase and nano-level ceramic phase are formed in the TiC-based metal ceramic microstructure to achieve micro-nano dual-phase strengthening. The present invention has the characteristics of simple process flow, easy operation, low cost, and conducive to industrialization.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal ceramic preparation, relates to a TiC-based metal ceramic material, and specifically relates to a preparation method of a TiC-based metal ceramic material jointly reinforced with (Ti, W, Mo)C micro-nano ceramic phases. Background Art

[0002] Traditional WC-based cemented carbide has poor high-temperature oxidation resistance, and the solubility of WC in steel increases at high temperatures, making it easy to cause adhesive wear on the contact surface with the steel, reducing the service life of the tool. TiC / TiCN-based cermets have excellent properties such as stable chemical properties, high hardness, good high-temperature oxidation resistance, and a low friction coefficient with steel, which can effectively inhibit its reaction with the contact surface of the workpiece. Compared with WC-based cemented carbide, TiC / TiCN-based cermets have low preparation costs and abundant titanium resources, making them an ideal material to replace WC-based cemented carbide tools. However, the wettability of TiC / TiCN and the metal bonding phase is poor, which affects the density and interfacial bonding strength of the material. During the high-temperature sintering process, TiC grains tend to coarsen and grow abnormally. Effectively controlling the alloy structure and improving the interfacial bonding strength are the key to preparing TiC / TiCN-based cermets.

[0003] To improve the wettability of TiC / TiCN and the metal binder phase, existing technologies incorporate IVb, Vb, and VIb transition metal carbides to form complex microstructures, such as core-ring structures, weak core-ring structures, and multi-core-ring structures. This compositional design influences the size, morphology, and distribution of the ceramic phase grains. A complex microstructure with a uniform distribution of fine and coarse grains is beneficial for improving the material's mechanical properties. Fine grains enhance hardness and strength, while coarse grains ensure fracture toughness. However, there have been no reports of TiC-based cermets being reinforced with (Ti, W, Mo)C micro- and nano-ceramic phases. Summary of the Invention

[0004] In response to the above technical problems, the present invention provides a preparation technology for (Ti, W, Mo) C micro-nano ceramic phases to jointly strengthen TiC-based cermets, so that the product has better performance.

[0005] The technical solution adopted by the present invention to solve the technical problem is: TiC-based metal ceramic material, the raw material components of which are as follows by mass percentage: WC 10-20%, Mo 5-10%, Co 5-10%, Ni 10-20%, and the balance is TiC.

[0006] Furthermore, the content of Co+Ni in the above TiC-based metal ceramic material is 10-20 wt%.

[0007] Furthermore, in the above TiC-based metal ceramic material, WC+Mo≥20wt%.

[0008] The preparation method of the above-mentioned TiC-based metal ceramic material specifically comprises the following steps:

[0009] a. Weighing ingredients: Prepare raw materials according to the raw material composition ratio of the above TiC-based cermet material;

[0010] b. Wet ball milling: The raw materials prepared in step a and carbide grinding balls are added together to a ball mill, and wet ball milling is performed to obtain a mixed slurry;

[0011] c. Vacuum drying: The mixed slurry obtained in step b was vacuum dried to obtain a mixed powder;

[0012] d. Pressing: The mixed powder obtained in step c is pressed into a compact by single-phase pressing;

[0013] e. Vacuum sintering: The compact obtained in step d is heated to 1350-1450°C under vacuum conditions and kept at this temperature for 0.5-1h to obtain a TiC-based cermet material.

[0014] In the above step b, alcohol is used as the medium during ball milling, and WC-Co cemented carbide balls are used as grinding balls.

[0015] In the above step b, the ball milling speed is controlled to be 250 r / min, the ball milling time is greater than 72 h, and the ball-to-material ratio is 5:1-10:1.

[0016] In the above step c, the drying temperature of vacuum drying is 60° C. and the drying time is 12 h.

[0017] In the above step d, the mixed powder obtained in step c is ground and passed through a 200-mesh sieve, and then pressed.

[0018] In the above step d, the pressing pressure is 80 MPa.

[0019] Furthermore, in the above step e, heating to 1400° C. is performed under vacuum conditions and kept warm for 1 hour.

[0020] The present invention has the following beneficial effects: by varying the contents of WC, Mo, Co, and Ni, a micronized (Ti, W, Mo) C ceramic phase and a nanometerized (Ti, W, Mo) C ceramic phase are formed in the TiC-based cermet. In the microstructure of the TiC-based cermet material of the present invention, both a micronized (Ti, W, Mo) C ceramic phase and a nanometerized (Ti, W, Mo) C ceramic phase are observed, achieving dual-phase reinforcement. The present invention has the advantages of a simple process flow, ease of operation, low cost, and suitability for industrialization. The vacuum sintering method can be used to prepare wear-resistant TiC-based cermets, resulting in a TiC-based cermet material with high toughness, high hardness, and excellent wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The (Ti, W, Mo)C micro-nano ceramic phase prepared in the embodiment of the present invention jointly strengthens the TiC-based metal ceramic microstructure. DETAILED DESCRIPTION

[0022] The technical solution of the present invention can be implemented in the following manner.

[0023] The TiC-based cermet material comprises the following raw materials by weight: WC 10-20%, Mo 5-10%, Co 5-10%, Ni 10-20%, and the balance TiC. Preferably, the TiC-based cermet material comprises Co+Ni at 10-20% by weight and WC+Mo at ≥20% by weight.

[0024] The preparation method of the above-mentioned TiC-based metal ceramic material specifically comprises the following steps:

[0025] a. Weighing ingredients: Prepare raw materials according to the raw material composition ratio of the above TiC-based cermet material;

[0026] b. Wet ball milling: The raw materials prepared in step a and carbide grinding balls are added together to a ball mill, and wet ball milling is performed to obtain a mixed slurry;

[0027] c. Vacuum drying: The mixed slurry obtained in step b was vacuum dried to obtain a mixed powder;

[0028] d. Pressing: The mixed powder obtained in step c is pressed into a compact by single-phase pressing;

[0029] e. Vacuum sintering: The compact obtained in step d is heated to 1350-1450°C under vacuum conditions and kept at this temperature for 0.5-1h to obtain a TiC-based cermet material.

[0030] Preferably, in the above step b, alcohol is used as the medium for ball milling, WC-Co carbide balls are used as grinding balls; the ball milling speed is controlled to be 250 r / min, the ball milling time is greater than 72 h, and the ball-to-material ratio is 5:1-10:1.

[0031] The present invention adopts vacuum drying to avoid the influence of external air on the material. Preferably, in the above step c, the vacuum drying temperature is 60°C and the drying time is 12 hours.

[0032] Preferably, in the above step d, the mixed powder obtained in step c is ground and passed through a 200-mesh sieve before being pressed; the pressing pressure is 80 MPa.

[0033] Preferably, in the above step e, heating to 1400° C. is performed under vacuum conditions and kept warm for 1 hour.

[0034] The technical solutions and effects of the present invention are further illustrated below through practical examples.

[0035] Example

[0036] Preparation of TiC-based cermets reinforced by (Ti, W, Mo) C micro-nano ceramic phases:

[0037] 1. Weighing ingredients: the mass fraction of TiC is 51wt%, the mass fraction of WC is 20wt%, the mass fraction of Mo is 5wt%, the mass fraction of Co is 6wt%, and the mass fraction of Ni is 12wt%.

[0038] 2. The preparation method comprises the following steps:

[0039] (1) Wet ball milling (ball-to-material ratio is 10:1)

[0040] Add all powders and Wo-Co carbide to a ball mill using 75% alcohol (mass fraction) as the medium. Add enough alcohol to submerge all powders and grinding balls, but not more than half the volume of the mill. After nitrogen is pumped out of the sealed mill, milling is performed. The mill speed is controlled at 250 rpm for 72 hours. The resulting wet-milled slurry is passed through a 200-mesh sieve and set aside.

[0041] (2) Drying: The mixed slurry prepared in step (1) is placed in a vacuum drying oven for drying at a heating temperature of 60° C. for 12 h to obtain a mixed powder.

[0042] (3) Pressing: The mixed powder prepared in step (2) is subjected to single-phase pressing on a hydraulic press at a pressing pressure of 80 MPa to obtain a 20 mm*10 mm*10 mm compact.

[0043] (4) Sintering: The compact prepared in step (3) is placed in a vacuum atmosphere for sintering at a temperature of 1400° C. for 1 hour, and then cooled in the furnace to obtain a TiC-based metal ceramic material reinforced with (Ti, W, Mo)C micro-nano ceramic phases.

[0044] 3. Observe the microstructure of the prepared TiC-based cermet material, such as Figure 1 As shown, (Ti, W, Mo) C micron-scale ceramic phase and (Ti, W, Mo) C nano-scale ceramic phase can be seen.

Claims

1. A method for preparing a TiC-based cermet material, characterized in that The steps include: a. Weighing ingredients: Prepare raw materials according to the raw material composition ratio of the TiC-based cermet material, wherein the raw material composition is WC 20%, Mo 5%, Co 5~10%, Ni 10~20% by mass, the balance is TiC, and Co+Ni is 10~20wt%; b. Wet ball milling: The raw materials prepared in step a and WC-Co carbide grinding balls were added to a ball mill with a ball-to-material ratio of 10:

1. Alcohol was used as the medium for wet ball milling. The ball mill speed was controlled at 250 r / min and the milling time was 72 h. The mixed slurry was passed through a 200 mesh sieve and then set aside. c. Vacuum drying: The mixed slurry obtained in step b was vacuum dried at 60°C for 12h to obtain a mixed powder; d. Pressing: The mixed powder obtained in step c is pressed into a compact by single-phase pressing at a pressure of 80 MPa; e. Vacuum sintering: The compact obtained in step d is heated to 1400°C under vacuum conditions and kept at this temperature for 1 hour to obtain a TiC-based cermet material reinforced with (Ti, W, Mo)C micro-nano ceramic phases.

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