Preparation and properties of ultra-fine TiCN matrix cermets by vacuum microwave sintering

Abstract

Ultra-fine titanium carbonitride (TiCN) matrix materials with a grain size less than 1 μm were successfully prepared by vacuum microwave sintering. The milling process for raw TiCN particles and the microstructure and properties of cermets produced with a composition of 15wt.%WC-17wt.%(Co+Ni)-9wt.%Mo 2 C-59wt.%Ti 0.7 N 0.3 and sintered by vacuum microwave were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that a ball-to-powder mass ratio of 8:1 and a milling time of 50 h provided appropriate conditions for the production of ultra-fine TiCN solid solution powders. The use of vacuum microwave sintering produced cermets with much finer grain and black core structures and higher relative density and hardness than those produced by vacuum sintering technology.

Ti (C, N)-based cermets sintered under high pressure

“…The conventional production routes are vacuum sintering (NS) [10][11][12] and hot isostatic pressing (HIP) [4], under vacuum, and nitrogen or argon atmosphere. The emerging technologies are also used in the fabrication of cermets, including spark-plasma-sintering (SPS) [4,13,14], self-propagation hightemperature synthesis (SHS) [15] and microwave vacuum sintering (MVS) [16,17]. The main mechanical properties of cermets produced via different production routes can be seen in Table 1.…”

A Novel Approach by Spark Plasma Sintering to the Improvement of Mechanical Properties of Titanium Carbonitride-Reinforced Alumina Ceramics

“…Normally, with decreasing x, the unit cell parameter of TiCN decreases linearly and the hardness is lower, but in this case, in contrast, the toughness was enhanced [ 11 , 12 ]. Titanium carbonitride exhibits improved mechanical properties compared to TiC in view of TiN in solid solutions with TiC and combines a high degree of hardness, good wear resistance with the low friction coefficient of TiC, and the higher value of toughness and chemical resistance of TiN [ 13 , 14 ]. In order to find more effective solutions to improving the mechanical properties of alumina composites, the following methods of sintering were used: pressureless sintering (PS), conventional sintering, two-step microwave sintering, hot pressing (HP), and spark plasma sintering [ 15 , 16 ].…”

“…To date, there have been no studies of the mechanical properties of Al 2 O 3 /ZrO 2 /Ti(C,N) composites with different ratios of C to N in titanium carbonitride solid solution. Zirconia-alumina matrix composites reinforced with the addition of Ni, Ti, and Mo as a binder phase were sintered by microwave, repetitious-hot-pressing, and HIP (hot isostatic pressing) and tested [ 13 , 14 ]. There has also not been any analysis of the influence of Ti(C,N) powder addition of a nanoscale size on the properties of alumina-zirconia matrix composites.…”

Characterization of TiCN thin films deposited by Dc-Pulsed PACVD using methane precursor

“…Tools deposited with hard coatings, like TiN, TiCN, TiC, have already been used successfully for many industrial application [3][4][5][6] . The PACVD process is affected by several process parameters, like discharge voltage, current density, gas pressure, gas composition and flow rate [7][8][9] . In the present research, the influence of the CH 4 / (CH 4 +N 2 ) gas flow ratio on characteristics of PACVD TiCN thin film on the hot -work tool steel has been investigated.…”