Synthesis of Metal Matrix Composites Based on CrxNiy-TiN for Additive Technology

Abstract

The novelty of this work consists of obtaining original fundamental data on the laws of synthesis of new metal matrix composite materials for additive technologies. CrN + TiNi composites were obtained using the method of self-propagating high-temperature synthesis. In this work, analysis of the parameters of the synthesis of composite materials as well as their structure and phase composition were carried out. A scheme for the formation of a composite structure is established; it is shown that the phase composition is represented by 54.6 wt.% CrN and 45.4 wt.% TiNi. It was shown that composites based on the system are suitable for machines that make use of direct laser deposition to grow layers of materials. Sample structure and phase parameters were studied. It is shown that titanium nitride particles are uniformly distributed in the CrNi intermetallic matrix, the TiN particle size ranges from 0.3 to 9 μm and the average particle size is 2.8 μm. The results obtained indicate the possibility of synthesizing promising metal matrix composite materials for additive technologies. Such materials may have increased hardness, operating temperature and strength.

Study of the Phase Composition, Structure and Mechanical Properties of Synthetic Composites Produced by High-Temperature Vacuum Sintering of SHS-Fabricated CrNi-TiN Powders

“…On the other hand, the use of such a material may be impractical in conditions where the requirements for physical and mechanical characteristics are less stringent. In [22], composite metal-matrix CrNi-TiN materials were obtained from a CrN-TiNi powder mixture by self-propagating high-temperature synthesis. The authors of the above paper have found that the particles of the CrNi-TiN composite SHS-fabricated powder, similar to (Ni-Ti)-TiB 2 , consist of a matrix (CrNi) and ceramic particles (TiN).…”

“…Additionally, their mechanical properties have to be studied both at room temperature and at elevated temperatures. It must also be noted that in [17,18,22], laboratory-fabricated composites were used and those were produced from pressed workpieces with a weight of ≤25 g, a diameter of ≤23 mm, and a height of ≤40 mm. Meanwhile, a transition from laboratory-based fabrication to industrial-scale fabrication entails changes in the synthesis conditions that may affect the phase composition and structure of final SHS products.…”

Structure and Properties of Metal-Matrix Composites Based on an Inconel 625–TiB2 System Fabricated by Additive Manufacturing

“…In our previous works [24,25], we obtained composite powder materials, CrNi-TiN and (Ni-Ti)-TiB 2 , from CrN-TiNi and NiB-Ti powder mixtures using self-propagating high-temperature synthesis (SHS). The structure of these powders consisted of a CrNi/Ni-Ti intermetallic matrix wherein TiN/TiB 2 particles were evenly distributed.…”

Effect of Mechanical Activation of Al-Ti-B Powder Mixture on Phase Composition and Structure of Al-TiB2 Composite Materials Obtained by Self-Propagating High-Temperature Synthesis (SHS)

“…The particle size varied from 0.1 to 4 µm, and their average size was 0.57 µm. In another study [ 10 ], we synthesized composite structured particle powders of CrNi-TiN using the SHS method. The particle structure consisted of titanium nitride (TiN) ceramic inclusions, which were uniformly distributed throughout the CrNi intermetallic matrix.…”

“…CrNi-TiN powders were successfully used as feedstock for the production of composite materials by direct laser growth. The hardness of such materials is higher than the hardness of analogues obtained from Inconel powder [ 10 ]. In [ 9 , 10 ], the authors found that ceramic particles in the metal matrix composites of CrNi-TiN and (Ni-Ti)-TiB 2 were formed during SHS (in situ) due to exothermic reactions of the initial components of the NiB-Ti and CrN-TiNi powder mixtures.…”