Numerical simulation and experimental verification of a novel double-layered split die for high-pressure apparatus used for synthesizing superhard materials

Abstract

Based on the principles of massive support and lateral support, a novel double-layered split die (DLSD) for high-pressure apparatus was designed to achieve a higher pressure-bearing capacity and larger sample cavity. The stress distributions of the DLSDs with different numbers of divided blocks were investigated by the finite element method and compared with the stress distributions of the conventional belt-type die (BTD). The results show that the cylinders and first-layer supporting rings of the DLSDs have dramatically smaller stresses than those of the BTD. In addition, increasing the number of divided blocks from 4 to 10 gradually increases the stress of the cylinder but has minimal influence on the stress of the supporting rings. The pressure-bearing capacities of the DLSDs with different numbers of divided blocks, especially with fewer blocks, are all remarkably higher than the pressure-bearing capacity of the BTD. The contrast experiments were also carried out to verify the simulated results. It is concluded that the pressure-bearing capacities of the DLSDs with 4 and 8 divided blocks are 1.58 and 1.45 times greater than that of the BTD. This work is rewarding for the commercial synthesis of high-quality, large-sized superhard materials using a double-layered split high-pressure die.

Keywords

split die / prismatic cylinder / pressure-bearing capacity / high-pressure apparatus / superhard material / FEM

References

[1] Xu B., Tian Y.J. Superhard materials: recent research progress and prospects. Sci. China Mater., 2015, 58(2): 132.

[2] Ichida Y., Ohfuji H., Irifune T., Kunimoto T., Kojima Y., Shinmei T. Synthesis of coarse-grain-dispersed nano-polycrystalline cubic boron nitride by direct transformation under ultrahigh pressure. Diamond Relat. Mater., 2017, 77, 25.

[3] Han Q.G., Ban Q.C., Zhu P.W. Design of a novel large volume cubic high pressure apparatus for raising the yield and quality of synthetic diamond. J. Cryst. Growth, 2015, 422, 29.

[4] Chen H., Jia C.C., Li S.J. Effect of sintering parameters on the microstructure and thermal conductivity of diamond/ Cu composites prepared by high pressure and high temperature infiltration. Int. J. Miner. Metall. Mater., 2013, 20(2): 180.

[5] Taniguchi T., Akaishi M., Kanke Y., Yamaoka S. TiC-diamond composite disk-heater cell assembly to generate temperature of 2000°C in a large-volume belt-type high-pressure apparatus at 10 GPa. Rev. Sci. Instrum., 2004, 75(6): 1959.

[6] Miyakawa M., Taniguchi T. Homogeneous heating of a sample space by a modified heating assembly in a belt-type high-pressure apparatus. Rev. Sci. Instrum., 2015, 86(2): 025101.

[7] Xu C., He D.W., Wang H.K., Guan J.W., Liu C.M., Peng F., Wang W.D., Kou Z.L., He K., Yan X.Z., Bi Y., Liu L., Li F.J., Hui B. Nano-polycrystalline diamond formation under ultra-high pressure. Int. J. Refract. Met. Hard Mater., 2013, 36, 232.

[8] Fontanari V., Bellin F., Visintainer M., Ischia G. Study of pressure sensitive plastic flow behaviour of gasket materials. Exp. Mech., 2006, 46(3): 313.

[9] Yang Y.F., Li M.Z., Wang B.L. Study on stress distribution of tangent split high pressure apparatus and its pressure bearing capacity. Diamond Relat. Mater., 2015, 58, 180.

[10] Khvostantsev L.G., Slesarev V.N. Large-volume high-pressure devices for physical investigations. Phys. Usp., 2008, 51(10): 1059.

[11] Shi L.Y., Liu Y.M., Huang J.H., Zhang S.Q., Zhao X.K. Growth kinetics of cubic carbide free layers in graded cemented carbides. Int. J. Miner. Metall. Mater., 2012, 19(1): 64.

[12] Sung C.M. A century of progress in the development of very high pressure apparatus for scientific research and diamond synthesis. High Temp. High Pressures, 1997, 29(3): 253.

[13] Bocquillon G., Léger J.M., Bogicevic C. Optimization of stress in the anvils of an opposed-movement multianvil device. Meas. Sci. Technol., 2002, 13(6): 885.

[14] Levitas V.I., Zarechnyy O.M. Modeling and simulation of strain-induced phase transformations under compression and torsion in a rotational diamond anvil cell. Phys. Rev. B, 2010, 82(17): 174124.

[15] Fang J.W., Bull C.L., Loveday J.S., Nelmes R.J., Kamenev K.V. Strength analysis and optimisation of double-toroidal anvils for high-pressure research. Rev. Sci. Instrum., 2012, 83(9): 093902.

[16] Feng B., Levitas V.I., Zarechnyy O.M. Plastic flows and phase transformations in materials under compression in diamond anvil cell: Effect of contact sliding. J. Appl. Phys., 2013, 114(4): 043506.

[17] Wang G.Z. Manufacturing and Application Technology of Superhard Materials, 2013, Zhengzhou, Zhengzhou University Press 150.

[18] Liu Z.W., Li M.Z., Han Q.G., Yang Y.F., Wang B.L., Sui Z. Numerical simulation and experiment on multilayer stagger-split die. Rev. Sci. Instrum., 2013, 84(5): 053903.

[19] Han Q.G., Li M.Z., Jia X.P., Ma H.A., Li Y.F. Modeling of effective design of high pressure anvils used for large scale commercial production of gem quality large single crystal diamond. Diamond Relat. Mater., 2011, 20(7): 969.

[20] Yang Y.F., Li M.Z., Wang B.L., Liu Z.W. A novel split-belt apparatus: the stress distribution and performance of its tangent split die. High Pressure Res., 2015, 35(3): 247.

[21] Getting I.C., Chen G.L., Brown J.A. The strength and rheology of commercial tungsten carbide cermets used in high-pressure apparatus. Pure Appl. Geophys., 1993, 141(2–4): 545.

[22] Klünsner T., Wurster S., Supancic P., Ebner R., Jenko M., Glätzle J., Püschel A., Pippan R. Effect of specimen size on the tensile strength of WC-Co hard metal. Acta Mater., 2011, 59(10): 4244.

[23] Han Q.G., Ma H.A., Li R., Zhou L., Tian Y., Liang Z.Z., Jia X.P. Finite element analysis of high-pressure anvils according to the principle of lateral support. J. Appl. Phys., 2007, 102(8): 084504.