High-obdurability Ti (C, N) base metal ceramic and preparation method thereof

A high-strength and toughness, base metal technology, applied in the field of high-strength and toughness Ti-based cermet and its preparation, can solve the problems of reducing the bending strength and hardness of the cermet, reducing the service life, reducing the wear resistance of materials, etc., and improving the durability. , improved service life, cost-effective effect

Active Publication Date: 2013-02-13
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AI-Extracted Technical Summary

Problems solved by technology

From the strength-toughness theory and R&D practice of cermets, the way to improve its fracture toughness is mainly to increase the content of metal binder phase in the material and develop coarse-grai...
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Abstract

The invention provides a high-obdurability Ti (C, N) base metal ceramic and a preparation method of the high-obdurability Ti (C, N) base metal ceramic. The high-obdurability Ti (C, N) base metal ceramic comprises the following components based on parts by weight: 7.0-8.7 of C, 3.0-3.9 of N, 35-44 of Ti, 22-32 of Ni, 12-18 of Mo, 5-8 of W, 0.5-2.0 of Cr and 1.0-2.5 of Nb, wherein 0.5-1.0 part of C is induced from a carbon nano-tube; and Ti is introduced from Ti (C, N) solid solution, and the solid solution consists of 70-90wt% of coarse grain (the grain size is 4-10mu m) and 10-30wt% of fine grain, wherein the size of the fine grain ceramic phase is 1/40-1/10 of the size of the coarse grain ceramic phase. The preparation method is characterized by comprising the following steps: firstly, carrying out surface modification treatment on the carbon nano-tube by plasma, carrying out ultrasonic dispersion, and adding into the mixture; and preparing the mixture which meets the components requirement, sequentially mixing materials, forming, degreasing to obtain a metal ceramic sintering body through a specific combined vacuum sintering method. According to the method, the metal ceramic is higher in rigidity, bending strength and breaking tenacity.

Technology Topic

Surface modificationCrystallite +7

Examples

  • Experimental program(4)

Example Embodiment

[0025] Example 1:
[0026] Process 1: When formulating the mixture, 0.5 parts of carbon is introduced by carbon nanotubes; Ti is introduced by Ti(C,N) solid solution, the solid solution is made of 70wt% Ti(C,N) with a particle size of 9.24μm and 30wt% 、The composition of Ti(C,N) with a grain size of 0.22μm;
[0027] The surface modification treatment of carbon nanotubes by plasma is carried out in a glow discharge plasma furnace. During the glow discharge plasma treatment, the purity of the argon used is ≥99.0%, and the argon pressure in the furnace cavity is 40 Pa. The voltage is 600V, the working current is 0.4A, and the processing time is 60min;
[0028] The mixing process is carried out in a planetary ball mill. The speed of the ball mill is 180rpm and the time is 24h;
[0029] The added amount of forming agent polyvinyl alcohol is 3wt%, and the pressure used for compression molding is 250MPa;
[0030] The degreasing process is carried out under the condition that the vacuum degree is higher than 10Pa, and the heating rate between 200-400℃ is 0.3℃/min;
[0031] The vacuum degree of vacuum sintering is higher than 1.0×10 -1 Pa. Vacuum sintering is divided into two stages. First, the green compact is heated to 1330°C, and the temperature is directly cooled to 1200°C with the furnace without heat preservation, and the heat preservation is 20h.
[0032] Under the above preparation process conditions, the properties of cermets with different composition ratios are shown in Table 3.
[0033] Table 3 Properties of different cermets prepared by process 1
[0034] ingredient 1 # 2 # 3 # 4 # Flexural strength σ b (MPa) 2234 2276 2338 2355 Hardness (HRA) 90.7 90.5 90.3 90.2 Fracture toughness (MN·m -3/2 ) 18.2 17.4 19.4 18.7

Example Embodiment

[0035] Example 2:
[0036] Process 2: When preparing the mixture, 0.75 parts of carbon is introduced by carbon nanotubes; Ti is introduced by Ti(C,N) solid solution, the solid solution is composed of 80wt% Ti(C,N) with a particle size of 7.68μm and 20wt% 、The composition of Ti(C,N) with a grain size of 0.43μm;
[0037] The surface modification treatment of carbon nanotubes by plasma is carried out in a glow discharge plasma furnace. During the glow discharge plasma treatment, the purity of argon used is ≥99.0%, and the pressure of argon filled into the furnace cavity is 80 Pa. The voltage is 700V, the working current is 0.5A, and the processing time is 50min;
[0038] The mixing process is carried out in a planetary ball mill. The speed of the ball mill is 180rpm and the time is 24h;
[0039] The added amount of forming agent polyvinyl alcohol is 3wt%, and the pressure used for compression molding is 250MPa;
[0040] The degreasing process is carried out under the condition that the vacuum degree is higher than 10Pa, and the heating rate between 200-400℃ is 0.4℃/min;
[0041] The vacuum degree of vacuum sintering is higher than 1.0×10 -1 Pa. Vacuum sintering is divided into two stages. First, the green compact is heated to 1350°C, and the temperature is directly cooled to 1220°C with the furnace without heat preservation, and the heat preservation is 16h.
[0042] Under the above preparation process conditions, the properties of cermets with different composition ratios are shown in Table 4.
[0043] Table 4 Properties of different cermets prepared by process 2
[0044] ingredient 1 # 2 # 3 # 4 # Flexural strength σ b (MPa) 2267 2291 2349 2406 Hardness (HRA) 90.9 90.6 90.3 90.3 Fracture toughness (MN·m -3/2 ) 18.5 18.7 20.9 21.8

Example Embodiment

[0045] Example 3:
[0046] Process 3: When preparing the mixture, 1.0 part of carbon is introduced by carbon nanotubes; Ti is introduced by Ti(C,N) solid solution, the solid solution is made of 90wt% Ti(C,N) with a particle size of 5.93μm and 10wt% 、The composition of Ti(C,N) with a grain size of 0.55μm;
[0047] The surface modification treatment of carbon nanotubes by plasma is carried out in a glow discharge plasma furnace. During the glow discharge plasma treatment, the purity of argon used is ≥99.0%, and the pressure of argon filled into the furnace chamber is 100 Pa. The voltage is 800V, the working current is 0.6A, and the processing time is 40min;
[0048] The mixing process is carried out in a planetary ball mill. The speed of the ball mill is 180rpm and the time is 24h;
[0049] The added amount of forming agent polyvinyl alcohol is 3wt%, and the pressure used for compression molding is 250MPa;
[0050] The degreasing process is carried out under the condition that the vacuum degree is higher than 10Pa, and the heating rate between 200-400℃ is 0.5℃/min;
[0051] The vacuum degree of vacuum sintering is higher than 1.0×10 -1 Pa. Vacuum sintering is divided into two stages. First, the green compact is heated to 1370°C, and directly cooled with the furnace to 1250°C without heat preservation, and the temperature is kept for 8 hours.
[0052] Under the above preparation process conditions, the properties of cermets with different composition ratios are shown in Table 5.
[0053] Table 5 Properties of different cermets prepared by process 3
[0054] ingredient 1 # 2 # 3 # 4 # Flexural strength σ b (MPa) 2236 2263 2264 2291 Hardness (HRA) 90.9 90.8 90.5 90.2 Fracture toughness (MN·m -3/2 ) 18.1 18.2 19.0 20.4
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