Development of silicide coating over molybdenum based refractory alloy and its characterization

Preparation and ductile-to-brittle transition temperature of the La-TZM alloy plates

“…Molybdenum TZM alloys are highly desirable for a wide range of critical applications due to their high electrical and thermal conductivity, strength and creep resistance at elevated temperatures, high temperature stability, low coefficient of thermal expansion and excellent corrosion resistance in liquid metals [1][2][3][4][5][6][7]. They are widely used in aerospace, power generation, nuclear and fusion reactors, and military, industrial and chemical applications, where these alloys are subjected to high temperatures, liquid metal corrosion and other aggressive environments [8].…”

Oxidation Behavior of MoSi2-Coated TZM Alloys during Isothermal Exposure at High Temperatures

“…The phase constituting TZM alloys are composed of mainly Mo matrix with precipitates of TiC and/or ZrC. Detailed material properties have been reported elsewhere [1][2][3][4][5]. In particular, since the alloys are stable with liquid state metals, they have been applied in high temperature components such as atomic plant components.…”

Preparation and Characterization of Ir Coating on Mo Network with a W Bond-Coat

“…Because of the exceptional strength and stiffness at high temperatures in conjunction with high thermal conductivity and low thermal expansion, the refractory metal molybdenum (Mo) and its alloys are widely used in aeronautic and astronautic fields in addition to other high temperature applications [1][2][3] . However, they are susceptible to high temperature oxidation and exhibit a strong degradation in air [4][5][6] . The oxidation of Mo follows a parabolic law between 250~450 o C, and it changes into a linear law above 400 o C. At the temperature of 300 o C, Mo is oxidized into MoO 2 and it suffers a further oxidation at 600 o C to form MoO 3 , which is volatilized at 750 o C. Furthermore, high vaporization of MoO 3 leads to an extremely large mass loss and high oxidation rates above the temperature of 650 o C. Therefore, increasing the oxidation resistance of the refractory metal Mo and its alloys is crucial for their high-temperature applications in oxidizing environments.…”

“…Besides alloying with another oxidation resistant element, the oxidation resistance of Mo and its alloys can be greatly improved by applying high temperature protection coatings [4][5][6][7][8][9][10][11][12] . In addition to the classic silicide coatings prepared by diffusion process, the noble metallic iridium (Ir) coating turns out to be an effective oxygen barrier due to its low oxygen permeability up to 2100 o C together with its high melting temperature of 2440 o C [13][14][15][16][17][18][19][20][21][22][23][24] .…”