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

A base metal and ceramic technology, applied in the composition design, preparation process and application field of Ti-based cermet, can solve the problems of high price of TaC raw materials, increase product cost, tool failure, etc., to save manufacturing cost, long tool life, The effect of good surface quality

Active Publication Date: 2018-12-07
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these cases, stresses resulting from sudden and repeated thermal changes are superimposed on stresses of a purely mechanical nature and, if not properly addressed, can produce subcritical microcracks leading to premature tool failure
[0004] In order to solve the above problems, some commercial Ti(C,N)-based cermet tools add a large amount of TaC, which can be as high as 15%, but the price of TaC raw materials is high, which increases the product cost

Method used

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  • Ti(C,N) base metal ceramic and preparation method thereof
  • Ti(C,N) base metal ceramic and preparation method thereof
  • Ti(C,N) base metal ceramic and preparation method thereof

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Experimental program
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Embodiment 1

[0021] Ti(C,N)-based cermets were prepared from commercially available powders. Ti(C 0.5 ,N 0.5 ) powder Fisher particle size 1.5μm, WC powder Fisher particle size 1.0μm, Mo 2 The Fischer particle size of C powder is 1.85 μm, that of NbC powder is 2.0 μm, that of VC powder is 2.0 μm, that of Co powder is 1.5 μm, and that of Ni powder is 1.5 μm.

[0022]The raw material powders were weighed according to the composition ratio in Table 1 to prepare Ti(C,N)-based cermets with different compositions. Mixing is carried out on a planetary ball mill, using absolute ethanol as the dispersion medium, hard alloy balls with a diameter of Φ8-Φ10 as the ball milling medium, and adding 4wt.% PEG of the total amount of the mixed powder as the dispersant and forming agent. The rotational speed of the planetary ball mill is 250r / min, and the mixing ball milling time is 48h. The slurry was dried in a vacuum oven at 80°C. The samples were bidirectionally pressed with a pressing force of 100 ...

Embodiment 2

[0032] The cermets with No. 1, 5, 10, and 12 components in Table 1 were selected for indentation-quenching test to evaluate the thermal shock resistance. The indentation-quenching method is an effective method developed in recent years to evaluate the thermal shock resistance of brittle materials. The specific implementation steps are as follows: load a 20Kg or 30Kg load on a Vickers hardness tester with a cross-section polished sample, so that microcracks (prefabricated cracks) are generated at the tip of the diamond-shaped indentation. Then, under the protection of Ar, the sample was heated to 300 °C in a tube furnace muffle furnace until the temperature was uniform, and then quickly quenched into 25 °C water. Under the action of thermal stress, the prefabricated crack expands partially or completely. The relative heat resistance of Ti(C,N)-based cermets can be qualitatively evaluated by comparing the non-diffusion of pre-cracks, the ratio of steady-state growth and unstabl...

Embodiment 3

[0037] Select Ti(C,N)-based cermets with No. 4 and No. 9 components in Table 1 to make cutting tools, cermets with No. 4 components to make turning tools, and cermets with No. 9 components to make milling cutters.

[0038] The specific implementation steps for preparing Ti(C,N)-based cermet cutters are as follows: Weigh the raw material powder according to the composition ratio of No. 4 and No. 9 in Table 1, and mix the materials on a drum mixer. The alloy ball is a ball milling medium, and 2wt.% PEG of the total amount of the mixed powder is added as a dispersant. After the slurry is spray-dried and prepared, the No. 4 and No. 9 component mixed powders are respectively molded into indexable insert CNNG120408 and CCMT060204 compacts. The sintering is carried out in a degreasing-sintering integrated furnace, the sintering temperature is 1470-1520°C, the sintering time is 1h, and the vacuum degree is maintained in the range of 1-10Pa. After the sintered body is ground, it is pr...

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Abstract

The invention discloses Ti(C,N) base metal ceramic and a preparation method thereof. Raw materials of the metal ceramic comprise titanium carbonitride Ti(0.5 of C and 0.5 of N), tungsten carbide WC, molybdenum carbide / molybdenum Mo2C / Mo, niobium carbide NbC, vanadium carbide VC, cobalt Co and nickel Ni powder, wherein the content of NbC ranges from 3 wt% to 15 wt%, the VC content is 0.3-3%, and the VC content changes along with the content of NbC. Hard phases formed by the materials are of two core-ring structures, one structure is a ring-shaped phase structure containing typical black core phases and inner ring phases, or outer ring phases and black core phases, and the other structure is a ring-shaped phase structure containing white core phases. The total credit of the black core phasesin the ring-shaped phase structure containing the black core phases and the inner ring phases, or the outer ring phases and the black core phases is 10-20%, the total credit of the inner ring phasesis 0.5-2%, and the total credit of the white core phases in the ring-shaped structure containing the white core phases is 5-10%. Chemical components of some or all white core phases are different fromthose of the inner ring phases, and the content of the Nb element in some or all white core phases is 30-40 wt% higher than the content of the Nb element in the inner ring phases. The Ti(C,N) base metal ceramic has thermal shock resistant performance and cutting performance.

Description

technical field [0001] The invention belongs to the field of cermets, and in particular relates to the composition design, preparation process and application of Ti(C,N)-based cermets with low cost and high cutting performance Background technique [0002] Cermet is a type of composite material that uses ceramic powder and metal powder as raw materials, sinters at high temperature, and uses the metal phase to bond the ceramic phase into one. It combines the characteristics of hard ceramic phase and ductile metal phase with different mechanical properties, so that the material has high strength, high hardness and certain toughness, and is widely used in cutting tool materials and other wear-resistant parts. WC-Co cemented carbide is a typical representative material of cermet. In order to save global strategic resources such as tungsten and cobalt, Ti(C,N)-based cermets were invented in the 1930s, which are based on titanium carbide TiC, titanium nitride TiN or titanium carb...

Claims

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Application Information

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IPC IPC(8): C22C29/04C22C29/02B23B27/00B23C5/00
CPCB23B27/00B23B2222/16B23C5/00B23C2222/16C22C29/02C22C29/04
Inventor 丰平龚林余海洲
Owner CHINA THREE GORGES UNIV
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