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High-temperature nitriding


Krypton compounds (Ⅱ + MNla + MzN). Mo nitride surface can generate three types of nitride - M. 2N, Mo3N and MoN. When molybdenum alloy nitride nitride zone, including the formation of nitrides of alloying elements, such as TiN and N (LIM A 2A,[link widoczny dla zalogowanych], M.aT, MT alloy) of molybdenum in the cracking of ammonia and nitrogen atmosphere of nitrogen. Nitride layer of corrosion resistant molybdenum nitride white stripes and widened the spread of the inner form of dark stripes, the nitrogen in the solid solution of aluminum,[link widoczny dla zalogowanych], molybdenum nitride and alloy element nitride composition. Less nitrogen in = 950 ℃,[link widoczny dla zalogowanych], the nitride layer formed by two nitrides - MoN and Mo ~ N; when a l13O ℃ = 950 ℃ range from a single nitride when nitrogen composition - MozN. If the nitrogen in the> 1I30 ℃ will not be generated when the nitride layer. Nitriding temperature increases from 900 ℃ to 1100 ℃, when the nitridation time-lh, nitride layer thickness from 2 to 8m. To n, Nb and C as an alloying element molybdenum, in the other under the same conditions can be more than pure molybdenum nitrided layer thickness formed by the MoN and MmN nitride layer is more brittle. Easy to crack. Nitriding temperature increases and the extension of time will cause nitrogen increased brittleness of nitrided layer. If using a touch electric heating or plasma glow discharge,[link widoczny dla zalogowanych], then the sweet wine of molybdenum nitride alloys decision process will increase (Table 1). Nitride layer (№ N) has high hardness - 200OHm. Mo in the 1100 \. M-2A alloy at I100 \Dagger Mo-based pension will not increase in the hardness of molybdenum nitride and its alloys surface cladding layer has high wear resistance. Increased nitrogen content in the body of metal-based nitride layer, and the presence of nitrogen will cause alloy after 20 + C when the lower strength properties and plasticity. Molybdenum alloy nitride is the effective means to improve thermal stability, the test temperature 1000 ~ 1d00 ℃ Yes, increase the thermal stability of molybdenum 5O a 100. However, lead and its alloys nitride surface cladding layer does not have high temperature stability, so in an atmosphere of nitrogen oxide, you must wrap the surface of the nitride layer to be protective. Kun nitride solid solution with n the same. When nitride can be formed in the nitride layer NwNj, Nb and NbN nitride. Niobium alloy nitride alloy generated when the (zt, Fif, M. And others) nitride. Niobium nitride may have oxygen in the water was removed with ammonia, and nitrogen atmosphere. Under the same conditions in the other, ammonia nitrogen atmosphere thicker nitride can be formed. Niobium and its alloys nitrided layer (Table 2), is a niobium nitride and the nitrogen solid solution and the low n non-alloying of niobium nitride NbN and Nb + consisting of titanium, lead alloy and solid solution by mouth and I-fiN TiN nitrides constitute T 'or above a temperature of 1200'C, the nitride layer formed by the two areas. Generated on the surface hardness of more than 2000Hm NbN (e one phase), is generated inside with a light blue, the hardness of 15. 0-1600Hm the NbN (B one phase). One phase containing high nitrogen £ brittle layer compared with the B-layer combination is not strong. Niobium alloy nitride layer is much thicker than that of pure niobium. In the inner nitride (TiN within the area) to form the solid solution and dispersion of the alloy nitride saws can inhibit the re-crystallization. This helps center the Ministry of complete recrystallization, the sample remain on the surface of fibrous tissue to the 1200 - 1250 ℃. If more than in I350-1400 ℃ temperature, will produce nitride cluster, well connected to along the grain boundary into a piece of mesh forms of precipitation. The hardness of the nitride zone 250 - 350Hm, Heart Ministry 1001-Im followed by 1450-1480X ~ nitrogen homogenization annealing, nitrogen would be evenly distributed in the part cross section helpful. Solid solution of nitrogen can increase the body strength of niobium. Nitride did not cause the resulting increase in strength, but they will make along the grain boundaries of niobium and its alloys brittle. Regulatory strength after nitriding at 1000 ℃ heat added before the 25-3O. Nitride alloy at high temperature plastic deformation intensity in the 1000 and 1200 \Therefore, the work in the chemical activity of the media sulfuric acid, acetic acid,[link widoczny dla zalogowanych], phosphoric acid and alkali corrosion resistance of nitrogen in the products and offerings to improve the thermal strength of the parts should give nitriding. * 25 *

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