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9XV International Symposium on Self-Propagating High-Temperature Synthesis
PRODUCTION OF LAYERED COMPOSITE MATERIALS BASED ON TITANIUM BORIDES
P. M. Bazhin*", A. M. Stalin", A. S. Konstantinov", A. P. Chizhikov", and A. D. Prokopets"
aMerzhanov Institute of Structural Macrokinetics and Materials Science Russian Academy of Sciences, Chernogolovka, Russia e-mail: bazhin@ism.ac.ru
DOI: 10.24411/9999-0014A-2019-10019
Composite materials possessing higher strength and fracture toughness as compared to traditional homogeneous materials are widely used in industry. Among them, layered metal-intermetallic (or ceramic) composite materials (LCMs) are of great interest [1].
Free SHS compression is a promising method combining the production with consolidation of macrolayers in a single cycle for tens of second [2]. This method includes compaction and formation of synthesized material under the action of constant low pressure (~ 10-50 MPa).
Powders of titanium (PTS grade, 45 p,m, 87 wt %) and amorphous black boron (B-99A grade,1 p,m, 13 wt %) were used as starting reagents to prepare TiB with 30 wt % titanium binder. VT6 alloy with a size of 30 x 30 mm and a thickness of 7 mm was chosen as a substrate.
As a result, LCMs with 5-mm TiB-based ceramic material were prepared. During free SHS compression, the melting of surface layer of titanium alloy occurs; the combustion temperature of this composition was 1800°C. Under the action of external pressure after passage of combustion wave through the sample, the molten titanium and aluminum are mixed with synthesized ceramic composite at the interface (spectra 1, 4, and 5; Fig. 1). In this case, a transition zone 10-20 p,m thick is formed. The presence of transition zone favors an improvement in the adhesive strength between the layers. The transition zone is followed by ceramic composite consisting of titanium monoboride whiskers (spectra 2 and 3) with a size up to 15 p,m and initial titanium diboride grains less than 1 p,m in diameter, located in the titanium matrix.
Ti V 96.47 95.45 91.53 93.64 98.94
90.42 3.38 90.69 1.86 89.28 4.14
data of
These results showed the possibility of obtaining layered ceramic composites by combined use of SHS and high-temperature deformation.
This work was supported by the Russian Science Foundation (project no. 18-79-10254).
Spectrum B Al
Si
S1 2.98
S2 4.55
S3 7.21 0.65
S4 0.91 1.01
S5 1.06
S6 5.23
S7 6.36
S8 6.58
0.55
0.61 4.44
0.97 1.08
Fig. 1. SEM image and EDS transition zone of LCM.
ISHS 2019 Moscow, Russia
1. S.A. Zelepugin, Synthesis of the metal-intermetallic layered composite material of the Ti-TiAl3 system by various methods, M.: VIAM, 2016.
2. A.M. Stolin, P.M. Bazhin, A.S. Konstantinov, M.I. Alymov, Production of large compact plates from ceramic powder materials by free SHS compaction, Dokl. Chem., 2018, vol. 480, pp. 136-138.
