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METALWORKING EQUIPMENT METALWORKING EQUIPMENT
AND TOOLS AND TOOLS
Findings
size at a sintering temperature above 1. The optimal modes of spark plasma sintering of a nanostructured functional-gradient
the eutectic one. Based on the above, material, an analogue of the VK6 hard alloy, have been proposed:
the optimal temperature should be a) the sintering temperature is about 1300 ° C;
considered 1300 ° C. b) holding time 10 minutes;
c) pressure 80 MPa.
was chosen in such a way as to achieve of physical and mechanical properties of an innovative cutting material, which will increase
The holding time about 10 minutes
2. Optimization of the modes of spark plasma sintering provides the best combination
an approximation of the sintered system
hardness, GPa theoretical density, % Since the mechanical properties of the analogs equipped with carbide plates made by the traditional sintering method.
the durability of the cutting tool when cutting hard-to-machine materials in comparison with
of initial powders to phase equilibrium.
sintered TM is influenced by the pressure
created during SPS, the dependence of
the hardness and crack resistance of
the TM samples on the pressure value
at a sintering temperature of 1300 ° C
was investigated. This relationship is
shown in Fig. 5. The maximum values
of properties are achieved at a pressure
equal to 80 MPa.
Fig. 3. Graph of the dependence of the hardness (1) of the
samples and their density (2) on the sintering temperature
temperature. The density indicators
reach their maximum at a sintering
temperature of 1300 ° C. This is due
to the fact that, with an increase in the
sintering temperature, the pore size
in the obtained samples decreases.
Also it can be seen that the values
of hardness reach their maximum fracture toughness MPa-m1/2
(17.7 GPa) at a sintering temperature
of 1300 ° C, and a further increase Yu. O. Pristinsky, engineer of the laboratory of spark
in temperature does not lead to an plasma sintering MSTU STANKIN.
increase in hardness.
However, with an increase in
the SPS temperature, a decrease in This work was supported by the Ministry of Education and Science of Russia
the fracture toughness of the TM is temperature , ° C within the framework of the state assignment 11.1817.2017 / PCh.
noted (Fig. 4), which is associated Fig. 4. Graph of the dependence of the fracture toughness of the TM
with a significant increase in the grain samples on the sintering temperature References:
1. Borovskiy G. V., Grigoriev S. N., Maslov A. R. Modern technologies of material processing // M .: Mashinostroenie, 2015. -
304 p. with ill.
2. Novikov S.V., Peretyagin P.Yu., Pristinsky Yu. O. Electric pulse hardening of sintered hard alloys and superhard materials,
pressing and spraying of hard alloy coatings. In the materials of the VII International Scientific and Practical Conference
''Mechanical Engineering - Traditions and Innovations'' (MTI-2014), Moscow, FGBOU VPO MSTU ''STANKIN'', 2014, pp. 34 –
39.
hardness, GPa fracture toughness MPa-m1/2
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pressure, MPa
Fig. 5. The graph of the dependence of hardness (1) and crack resistance (2) on pressure during sintering at 1300 ° C.
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