Novel Nitride Materials Synthesized at High Pressure

Abstract

Nitride materials including conventional manmade superhard light-element nitrides, such as cubic boron nitride (cBN), cubic silicon nitride (γ-Si3N4), and carbonitrides, have been extensively used for machining (e.g., turning, cutting, grinding, boring, drilling) and coating of ferr ous alloys due to their remarkable performances of high rigidity, high melting-point, and prominent chemical and thermal stabilities. However, to some degree, superhard nitrides merely compensate for the adverse limitations of diamond: reaction (with iron), oxidation, and graphitization at moderate temperatures; they are still unable to dominate the market owing to their relatively low hardness when compared to diamond. Therefore, recent efforts toward the preparation of nitride materials with outstanding mechanical performance and chemical inertness have focused on synthesizing ternary light-element nitride compounds and harvesting the effect of work hardening through microstructure manipulations. These new light-element nitrides are potential candidates to displace diamond in the cutting business. On the other hand, incorporation of transition-metal atoms into the dinitrogen triple-bond can form novel hard transition-metal nitride alloys (TMNAs), such as Mo-N, W-N, Pt-N, Ir-N, Os-N, etc., which are potential candidates for the cutting, coating, and polishing of iron-group metals. However, synthesis of high-crystallinity and stoichiometric TMNAs via traditional routes is challenging, since the embedded nitrogen in the transition-metal lattice is thermodynamically unfavorable at ambient condition. A novel approach involving ion-exchange reactions under moderate pressure and temperature has been developed in recent years for preparation of well-crystallized stoichiometric TMNAs, which have quickly been realized as emergent materials in electronics, catalysts, and superconductors as well.

Karakterisasi Morfologi Dan Komposisi Lapisan Komposit Ni-Tin-Aln/Si3n4 Dengan Metode Elektrodeposisi Rapat Arus Pulsa

“…Sementara itu unsur N tidak terdeteksi pada lapisan yang terbentuk. Hal ini disebabkan karena N merupakan unsur yang ringan sehingga sulit terdeteksi oleh EDS [16]. Oksigen yang terdeteksi cukup banyak karena sifatnya yang reaktif pada semua bahan logam [17].…”

Machining of Inserts with PCD Cutting-Edge Technology and Determination of Optimum Machining Conditions Based on Roundness Deviation and Chip-Cross Section of AW 5083 AL-Alloy Verified with Grey Relation Analysis

“…We consider the value of the coefficient ξ as 0.5 since both initial parameters have the same weight. The GRC and GRG values for each factorial design experiment were calculated according to Equations ( 4)- (6). Table 8 shows the GRG for each factorial experimental design experiment.…”

“…Super hard cutting materials have become permanently established in the range of global manufacturers who are constantly trying to innovate them and develop new methods in the manufacture of PCD tools [5]. The modern trend is to combine properties of known cutting materials such as coating sintered carbides with synthetic diamond or cubic boron nitride, which is constantly evolving [6]. Replaceable inserts with a cutting edge of PCD material are an essential component in the rational machining of non-ferrous materials and for achieving the required quality of the machined surface for roundness deviation and the performance of chip cross-section in finishing operations [7].…”

Synthesis, crystal structure, and properties of stoichiometric hard tungsten tetraboride, WB4

“…Inexpensive hard and superhard (with a Vickers hardness of around 40 GPa and above) materials are in much demand for various industrial applications. Novel carbides, 1 nitrides, [2][3][4][5][6][7][8] borides, [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] and other compounds of transition metals, 24,25 which can potentially combine high hardness and promising optical, electronic, and other properties, are the focus of extensive investigations. [26][27][28] Nowadays, one of the most widely used hard materials for commercial applications is tungsten carbide, WC.…”