POROSITY OF A HEAT-RESISTANT ALLOY MADE BY SPARK PLASMA SINTERING OF NICKEL POWDER OBTAINED BY ELECTRODISPERSING THE ZHS6U ALLOY IN WATER

Metallographic studies are required to expand the scope of practical application of powder materials obtained from waste of the ZhS6U alloy. The purpose of this work was to study the porosity of a heat-resistant alloy produced by spark plasma sintering of nickel powder obtained by electrodispersing the LC6U alloy in water. The work is based on the task of obtaining a heat-resistant nickel alloy with improved physical and mechanical properties and low cost. The alloy under study is obtained by spark plasma sputtering of nickel powders obtained by electroerosive dispersion of waste of the alloy ZhS6U in distilled water. The waste of heat-resistant alloy of the brand ZhS6U was used in the work, which was crushed by the method of electroerosive dispersion in distilled water at the original installation. Parameters of the installation during the disposal of waste ZhS6U: voltage at the electrodes 190–210 V; capacitance of the condenses 55–60 UF; pulse repetition frequency 180–200 Hz. As a result of local exposure to short-term electrical discharges between the electrodes, the alloy waste was destroyed with the formation of heat-resistant nickel powder particles. Sintering of heat-resistant nickel powder was carried out in the SPS 25-10 "Thermal Technology" system (USA) at a temperature of 1300 °C, a pressure of 40 MPa and a holding time of 10 min. It has been experimentally established that new heat-resistant alloys produced by spark plasma sintering of an electroerosive charge have a porosity of about 0.52 %. The practically nonporous structure of heat-resistant alloys is explained by the presence of particles of different fractions in the electroerosion charge, which ensures tight packing and the so-called "spark discharge plasma effect" during spark plasma fusion.

1. Eremin E.N., Filippov Yu.O., Davletkildeev N.A., Minnekhanov G.N. ZhS6U alloy structure study by atomic force microscopy. Omskij nauchnyj vestnik. 2011, no. 1 (97), pp. 24–29. (In Russ.).

2. Eremin E.N., Filippov Yu.O., Matalasova A.E. Research of carbide phases in alloy ZhS6U. Omskij nauchnyj vestnik. 2014, no. 3 (133), pp. 59–63. (In Russ.).

3. Eremin E.N., Filippov Yu.O., Minnekhanov G.N., Lopaev B.E. Research of phase transfor-mations in alloy by ZhS6U methods of thermal analysis. Omskij nauchnyj vestnik. 2013, no. 1 (117), pp. 63–68. (In Russ.).

4. Novikova O.V., Kochetkov V.A., Vinogradov A.I., Zhukov A.A., Tikhonov A.A., Marinin S.F. Application of gas-static pressing to increase operational reliability of turbine blades made of heat-resistant alloy of type ZhS6U. Zagotovitel'nye proizvodstva v mashinostroenii. 2007, no. 8, pp. 54–56. (In Russ.).

5. Ageeva E.V., Ageev E.V., Karpenko V.Yu. Study of the shape and elemental composition of powder obtained from tungsten-containing wastes of tool materials by electroerosive dispersion in an aqueous medium. Uprochnyayushchie tekhnologii i pokrytiya. 2014, no. 4 (112), pp. 14–17. (In Russ.).

6. Latypov R.A., Ageev E.V., Ageeva E.V., Novikov E.P. Study of aluminum powder ob-tained by electroerosive dispersion in distilled water. Vse materialy. Enciklopedicheskij spravochnik. 2016, no. 4, pp. 19–22. (In Russ.).

7. Ageeva E.V., Khoryakova N.M., Ageev E.V. Mor-phology and elemental composition of copper electro-erosive powders suitable for sintering. Vestnik mashi-nostroeniya. 2014, no. 10, pp. 66–68. (In Russ.).

8. Ageeva E.V., Hardikov S.V., Ageeva A.E. Structure and properties of sintered samples from electroerosive chromium-containing powders obtained in butyl alcohol. Sovremennye materialy, tekhnika i tekhnologii. 2021, no. 6 (39), pp. 4–11. (In Russ.).

9. Hardikov S.V., Ageeva E.V., Ageeva A.E. Analysis of wear-resistance characteristics of sintered articles from electric erosion powder of Kh13 steel obtained in butyl alcohol. Sovremennye materialy, tekhnika i tekhnologii. 2021, no. 6 (39), pp. 58–64. (In Russ.).

10. Latypov R.A., Ageev E.V., Ageeva E.V., Khoryakova N.M. Comparative X-ray spectral microanalysis of copper powder obtained by electro-erosion dispersion and copper powder PMS-1. Elektrometallurgiya. 2017, no. 4, pp. 36–39. (In Russ.).

11. Ageeva E.V., Latypov R.A., Ageev E.V., Altu-khov A.Yu., Karpenko V.Yu. Assessment of wear resistance of electric spark coatings ob-tained using electric erosion powders of high-speed steel. Izvestiya vysshih uchebnyh zavedenij. Poroshkovaya metallurgiya i funkcional'nye pokrytiya. 2015, no. 1, pp. 71–76. (In Russ.).

12. Latypov R.A., Ageeva E.V., Kruglyakov O.V., Latypova G.R. Electric erosion powders of mi-cro- and nanometric fractions for the production of hard alloys. Elektrometallurgiya. 2016, no. 1, pp. 16–20. (In Russ.).

13. Latypov R.A., Latypova G.R., Ageev E.V., Altukhov A.Y., Ageeva E.V. Elemental composition of the powder particles produced by electric discharge dispersion of the wastes of a VK8 hard alloy. Russian Metallurgy (Metally). 2017, vol. 2017, no 12, pp. 1083–1085.

14. Ageev E.V., Podanov V.O., Ageev A.E. Microstructure and elemental composition of powders obtained under the conditions of electric erosion metallurgy of heat-resistant nickel alloy wastes ZhS6U in water. Metallurg. 2022, no. 5, pp. 72–77. (In Russ.).