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Ti(C,N)-based metal ceramic preparation method

A base metal and ceramic technology, applied in the field of preparation of Ti-based cermet, can solve the problems of easy aggregation and growth of TiC particles, reduced sinterability and strength, poor material strength and toughness, etc. The existence of pores, the effect of good red hardness

Active Publication Date: 2014-05-07
郑汉东
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Problems solved by technology

[0002] The development of cermets has mainly gone through three processes: 1. TiC-Ni-based cermets were invented in Germany in 1929. Although they have excellent high-temperature mechanical properties and low density, due to the poor wettability of Ni to TiC particles, TiC Particles are easy to aggregate and grow, and the material strength and toughness are poor; 2. In 1956, Ford Company of the United States invented TiC-Mo 2 C-Ni cermet, the strength of cermet is improved; 3. In 1971, the Vienna University of Technology discovered that TiC-Mo 2 Adding TiN to C-Ni cermet can further refine the hard phase particles, improve high temperature creep resistance, red hardness, and room temperature strength and toughness.
[0003] However, with the introduction of TiN, denitrification occurs during the sintering process, which increases the porosity of the material. The total effect of denitrification is to reduce the sinterability and strength.
[0004] In recent years, researchers have carried out a lot of research. Through the design of components in material preparation, the study of reaction mechanism, the optimization of manufacturing methods and processing technology, it is hoped that the hardness and flexural strength of the material can be improved at the same time, making it comprehensive The performance can meet the needs of industrial production. However, according to the scope and proportion of domestic cermet products, its industrial development is still in the initial stage, and the performance still needs to be improved.
With the gradual understanding of nanomaterials, there are more and more studies on the preparation of nano-Ti(C, N)-based cermets by using nano-powders, but so far it has not been possible to prepare very dense Ti(C, N)-based cermets. There are many problems to be solved in the preparation process. In addition, the preparation cost of nano-ceramic powder is very high, so the development of a new sintering method suitable for nano-Ti(C, N)-based cermets and the process of preparing nano-mixed powders will become a major issue. previous research focus

Method used

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Embodiment 1

[0020] Embodiment 1: the preparation method of Ti(C, N)-based cermet of the present invention has the following steps:

[0021] A. Carry out raw material assembly, the mass percentage of each component in the raw material is: TiC 48.1%, TiN20%, WC 3%, Ni 20%, Mo 7%, C 0.5%, Y 0.4%, AlN 1%;

[0022] B. According to the ratio of adding 850 milliliters of absolute ethanol per kilogram of raw materials, add absolute ethanol to the above raw materials, wet mix the mixed materials on a planetary ball mill, the ball-to-material ratio is 8:1, and the ball mill speed is 300r / min , mixed in a ball mill for 72 hours;

[0023] C. Dry the mixed material slurry obtained in the above steps in an electric drying oven, the drying temperature is 78 ° C, and the drying time is 12 hours;

[0024] D, configuration mass percentage is the polyvinyl alcohol solution of 8%, and polyvinyl alcohol solution is added in the mixed material, and the quality of the polyvinyl alcohol solution that adds is 6%...

Embodiment 2

[0029] A. Carry out raw material assembly, the mass percentage of each component in the raw material is: TiC 49.6%, TiN15%, WC 5%, Ni 17%, Mo 9%, C 0.8%, Y 0.6%, AlN 3%;

[0030] B. According to the ratio of adding 850 milliliters of absolute ethanol per kilogram of raw materials, add absolute ethanol to the above raw materials, wet mix the mixed materials on a planetary ball mill, the ball-to-material ratio is 8:1, and the ball mill speed is 300r / min , mixed in a ball mill for 72 hours;

[0031] C. Dry the mixed material slurry obtained in the above steps in an electric drying oven, the drying temperature is 78 ° C, and the drying time is 12 hours;

[0032] D, configuration mass percentage is the polyvinyl alcohol solution of 8%, and polyvinyl alcohol solution is added in the mixed material, and the quality of the polyvinyl alcohol solution that adds is 6% of dry mixed material quality, dry granulation after uniform mixing, pass 200 mesh sieve;

[0033] E, molding the powde...

Embodiment 3

[0037] A. Carry out raw material assembly, the mass percentage of each component in the raw material is: TiC 40%, TiN15.2%, WC 7%, Ni 20%, Mo 11%, C 1%, Y 0.8%, AlN 5%;

[0038] B. According to the ratio of adding 850 milliliters of absolute ethanol per kilogram of raw materials, add absolute ethanol to the above raw materials, wet mix the mixed materials on a planetary ball mill, the ball-to-material ratio is 8:1, and the ball mill speed is 300r / min , mixed in a ball mill for 72 hours;

[0039] C. Dry the mixed slurry obtained in the above steps in an electric drying oven, the drying temperature is 73 ° C, and the drying time is 12 hours;

[0040] D, configuration mass percentage is the polyvinyl alcohol solution of 8%, and polyvinyl alcohol solution is added in the mixed material, and the quality of the polyvinyl alcohol solution that adds is 6% of dry mixed material quality, dry granulation after uniform mixing, pass 200 mesh sieve;

[0041] E, molding the powder obtained...

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Abstract

A Ti(C,N)-based metal ceramic preparation method sequentially comprises the steps of raw material matching, ball milling of the obtained mixture, drying, compression molding, degreasing, sintering and the like, and raw materials comprise, by mass, 40-60% of TiC, 10-20% of TiN, 3-7% of WC, 13-20% of Ni, 7-11% of Mo, 0.5-1% of C, 0.4-0.8% of Y and 1-5% of AlN; a rare earth element Y and AlN are added to raw material powder, and the rare earth element Y has a cleaning effect on a phase interface, so the bonding strength of the phase interface is enhanced, and the strength and the toughness of a material are improved; and the added AlN enhances the bonding phase of Ti(C,N)-based metal ceramic, so the hardness and the strength of the metal ceramic are improved. Cutting tools made by using the Ti(C,N)-based metal ceramic prepared in the invention have the advantages of low density, high hardness, small steel friction coefficient, small bonding wear and diffusion wear during cutting, and good red hardness.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a method for preparing Ti(C,N)-based cermets with low density and high hardness and low production cost. Background technique [0002] The development of cermets has mainly gone through three processes: 1. TiC-Ni-based cermets were invented in Germany in 1929. Although they have excellent high-temperature mechanical properties and low density, due to the poor wettability of Ni to TiC particles, TiC Particles are easy to aggregate and grow, and the material strength and toughness are poor; 2. In 1956, Ford Company of the United States invented TiC-Mo 2 C-Ni cermet, the strength of cermet is improved; 3. In 1971, the Vienna University of Technology discovered that TiC-Mo 2 Adding TiN to C-Ni cermet can further refine the hard phase particles, improve high temperature creep resistance, red hardness, and room temperature toughness. [0003] However, with the introduction of...

Claims

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Application Information

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IPC IPC(8): C22C29/02C22C29/00C22C1/05
Inventor 郑汉东
Owner 郑汉东