Time and cost constraints are necessary to reduce the manufacturing costs of Cobalt alloys and CoCrMo alloys. Some of these elements are obtained by mechanical machining and it is necessary to optimize the machining parameters for these products. Several researchers have conducted experimental studies on the machining of cobalt-based refractory materials in order to establish optimal cutting conditions for different cutting parameters. They have used several optimization techniques based on RSM methods, using sequential quadratic programming algorithms and Kriging interpolation to solve a constrained problem.

Research into the processing of cobalt alloys and CoCrMo alloys, which are widely used in manufacturing and aerospace, began a long time ago. Prior to that, all research was focused on improving material properties such as hardness, toughness, strength, wear resistance, corrosion resistance, and high-temperature resistance. Cobalt-chromium-molybdenum alloys are an improved material from the cobalt family and are used in a variety of biomedical applications.

In general, the term machinability can be defined as how easily the material can be machined or cut to the desired shape in terms of tool and process conditions, taking into account surface finish and tool life. The machinability of cobalt chromium molybdenum alloys is comparable to other advanced materials such as nickel and titanium alloys, which are classified as difficult-to-cut materials due to their unique characteristics of high strength, toughness, wear resistance, and low thermal conductivity.

Cobalt chromium molybdenum alloys are considered advanced materials and are popular in a variety of engineering and medical applications. However, it is classified as a difficult material to machine due to its unique combination of properties, including high strength, toughness, wear resistance, and low thermal conductivity.

The researchers found that tungsten disulfide (WS2) can be converted into a direct semiconductor with a band gap of 2.1 eV by controlling the chemical composition and number of layers due to the quantum confinement effect. In addition, WS2 has better saturable absorption properties than graphene and carbon nanotubes in the near- and mid-infrared bands. Due to these excellent properties, it is increasingly being used in laser saturable absorbers (SAs).

Tungsten disulfide (WS2) is promising electrocatalysis with a layered structure with adjustable electrical properties and exposed edges that can act as the active center. It is mainly used as an electrocatalyst for hydrogen evolution reactions. The surface of WS2 is inert; however, the catalytic activity of WS2 occurs at the lamellar edges, which determines the overall catalytic performance. In order to improve the catalytic effect of WS2, the electrolyte must be in complete contact with the WS2 layer.

Due to its unique band gap properties, inherent vacancy defects, and low electrical conductivity, WS₂ films can be used for catalysis. Catalysis including photocatalysis and electrocatalysis is essential in our daily life, and they have been widely used for environmental protection and clean energy generation.

Bulk tungsten disulfide (WS₂) can be stripped by physical and chemical methods, which are classified as mechanical and stripping method, and lithium-ion intercalation method. In recent years, in order to obtain large-area, high-quality monolayer tungsten disulfide films, researchers have tried to grow monolayer tungsten disulfide films on ingot substrates and then exfoliate them by atomic or molecular intercalation methods.

Two common methods for preparing tungsten disulfide (WS₂) films by chemical methods are chemical vapor deposition (CVD) and hydrothermal growth of single-crystal tungsten disulfide from aqueous solutions under high temperature and pressure conditions. CVD is the most common method used to prepare tungsten disulfide. The CVD method involves a reaction process in which a gaseous precursor reacts chemically on a solid surface to produce a solid deposit.