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A ti(c,n)-based cermet material and its carbon balance control method

A ceramic material and cermet technology, which is applied in the field of Ti-based cermet material and its carbon balance control, can solve the problems of unoptimistic production conditions, high cost of imported tools, increased workpiece processing cost, etc., and achieve simple, easy and precise control of the sintering process. , The effect of improving density and high mechanical properties

Active Publication Date: 2020-09-15
湖北麦拓新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the overall production status of domestic cermet knives is still not optimistic. The characteristic shown is that the production quality is unstable and cannot be compared with imported blades.
The overall performance of the cermet knives being tested in the Chinese market is significantly lower than that of the cermet knives commonly used in the Japanese market, and the product performance is unstable, especially the strength and toughness is poor
At present, most of the high-end cutting tools in the Chinese cutting tool market rely on imports, and the cost of imported cutting tools is quite expensive, and sometimes they have to be matched with imported machine tools, which greatly increases the cost of workpiece processing

Method used

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  • A ti(c,n)-based cermet material and its carbon balance control method
  • A ti(c,n)-based cermet material and its carbon balance control method
  • A ti(c,n)-based cermet material and its carbon balance control method

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Effect test

Embodiment 1

[0038] The first is the preparation of the mixture: using Ti(C,N) powder, (Ti,Re)(C,N) powder, WC powder, Cr 3 C 2 Powder, Ni powder, Co powder, Re powder, graphite powder and other raw materials. 11.5, N: a mixture of 4.6. Use absolute ethanol as the ball milling medium, the amount of absolute ethanol is 0.7:1 ratio of alcohol to material, YG8 cemented carbide balls are used as grinding balls, and the ball to material ratio is 7:1; the materials are mixed on a planetary ball mill at a speed of 200r / min, time 36h, oven dry at 80°C after obtaining the mixture. The mixed powder is compressed under a certain pressure (160Mpa). The compact is placed in a vacuum carbon tube furnace for vacuum sintering. The schematic diagram of the sintering process is shown in figure 2 shown. The vacuum degree in the furnace below 1000°C is 4.0×10 -2 Pa; above 1000°C, the staged sintering process is adopted, methane gas is introduced, the methane pressure in the furnace is 250Pa at 1000-13...

Embodiment 2

[0047] The composition combination, mixing method, preparation process and sintering route of Example 1 were adopted. In the sintering process of Example 2, adjust the methane pressure in the furnace during the solid-phase sintering stage at 1000 to 1350 ° C, and the methane atmosphere pressure is reduced to 200 Pa; the methane atmosphere pressure in the liquid-phase sintering stage is the same as that in Example 1; ℃ / min is increased to a cooling rate of 1.3 ℃ / min, and the vacuum degree is still the same as in Example 1.

[0048] Figure 5 The metallographic structure of the sintered body is given, and the structure is dense and free of defects. Figure 6 The SEM structure of the sintered body is given, which further confirms that the structure of the sintered body is compact, and no graphite phase and other phases are found. Figure 7 Shown is the XRD pattern of the sintered body, which shows that the structure of the sintered body is a two-phase structure, the hard phase ...

Embodiment 3

[0050] Changing the composition ratio of raw materials, the mass parts of the prepared cermet composition are Ti: 48.7, Ni: 20.5, Co: 4.3, W: 8.9, C: 10.8, N: 4.3, Cr: 0.6, Re: 1.9, mixed The material process, preparation process and sintering route are the same as in Example 1, and the methane pressure in the furnace is reduced to 70 Pa in the solid phase sintering stage at 1000-1350 °C; the methane atmosphere pressure in the liquid phase sintering stage and the cooling stage process are the same as in Example 1. After analysis, the metallographic structure and scanning structure of the sintered body have no other phase formation, which is a typical two-phase structure of cermet. The mechanical performance indicators of the sintered body are: hardness 1489HV, bending strength 1930MPa, fracture toughness K IC 8.8MPa·m 1 / 2 . Compared with Example 1, by adjusting the proportion of binder phase components in the raw material, reducing the content of the main carbide forming ele...

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Abstract

The invention discloses a carbon balance control method of a Ti(C,N)-based metal ceramic material. The method is characterized by comprising the following steps: adopting a sectional sintering processin a sintering stage at 1000-1500 DEG C; adjusting the highest temperature and the insulating time of the sectional sintering according to difference of components of original materials; introducingmethane CH4; and controlling the pressure of methane and cracking of methane at a high temperature to control the carbon potential in a sintering furnace to control carbon balance in a sintering bodyso as to prepare the metal ceramic material excellent in performance. By effectively controlling a high-temperature sintering process, the carbon potential in the furnace is controlled effectively according to a reaction characteristic of carbon in the metal ceramic preparation process, so that stability of product quality and optimized material strength and toughness are achieved.

Description

technical field [0001] The invention relates to the fields of mechanical processing and powder metallurgy, in particular to a Ti(C,N)-based cermet material and a carbon balance control method thereof. Background technique [0002] Ti(C,N)-based cermet tools have high hardness, wear resistance, red hardness, excellent chemical stability and extremely low friction coefficient, and are mainly used in high-speed finishing, semi-finishing and semi-finishing of steel and cast iron. roughing. Its high-temperature hardness is better than that of high-speed steel and WC-based cemented carbide, and its toughness is better than that of ceramic and superhard material tools. It also just fills the gap between WC-based cemented carbide tools and ceramic tools in the processing range. [0003] Relevant departments in our country have developed some grades of Ti(C,N)-based cermet tools, which can partially replace cemented carbide tools such as YG8 and YT15 in the cutting field. growth tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/04C22C1/05C22C1/10
CPCC22C1/051C22C29/005C22C29/04
Inventor 石增敏
Owner 湖北麦拓新材料科技股份有限公司
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