Page 9 - Stanochny park
P. 9

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












                                                                                   CREATE A BETTER FUTURE

                                                                        TOGETHER WITH OUR CUSTOMERS
                       pressure, MPa

 Fig. 5. The graph of the dependence of hardness (1) and crack resistance (2) on pressure during sintering at 1300 ° C.


 8  Stanochniy park
   4   5   6   7   8   9   10   11   12   13   14