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 Posted: Wed 19:22, 01 Dec 2010 Post subject: PUMA shoes wholesale N type thermocouple alloy hig |
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N type thermocouple alloy high temperature oxidation resistance and Mechanism
Hinder the diffusion process over. ■ co-main dish blending words thermoelectric nose heavy machine Jiang Lei of the ■ of one head U tongue Nicrpsil / Nisi! Taijin is a new type of thermocouple alloys, typically used in high temperature environment, its advantages and high temperature oxidation resistance directly affect the poor stability of the thermocouple thermoelectric power and service life. This work on N-type and K type thermocouple alloy at high temperature oxide layer morphology, phase composition, Taijin element distribution, the base oxidation in vivo comparative analysis of the situation, outlining the N-type thermocouple alloy excellent resistance to high temperature oxidation. Second, the experimental method the sample is ≠ 3.2ram, by 13OO ℃, 483h air oxidation of N-type and K type thermocouple alloys N type specimens from the hot junction point of section l5mm, K-type specimen cross-section from the hot junction To 4Omm x-ray microscopy with electron probe analyzer,[link widoczny dla zalogowanych], X-ray diffraction,[link widoczny dla zalogowanych], metallographic samples were observed pound oxide form, the distribution of alloying elements,[link widoczny dla zalogowanych], the base oxidative medicine, phase composition, etc. were analyzed. Third, the experimental results and discuss N-type, K type thermocouple alloy specimens of each sample Chart of oxide oxide powder X-ray diffraction results are as follows: NP very Desk Box: Cr2OaSiO2NiONiCr2O'jt hire feather fan material appears ● 2o l ((left) and Taijin element distribution map (right) is shown in Figure applications. t451 cicada Figure N-type and K type thermocouple oxidation of the positive and negative sets box Tu morphology (left) and element distribution box sets (right) ( The air in the l ~ oo'c, 483h) 'Instrument Materials 1989 - film (I) NN extremely alloys: SiO2MgONiONi2s / o} KP extremely alloy: NiOCr2O3NiCr20'} KI'I very Alloy: NiO-SiO ? MnONi2SiO.. (above Analysis of the oxide layer f} = {phase by diffraction intensity from the size of the row s) first graph (left) were oxidized form of the cold morning than the analysis, you can see fN-type alloy (NP,[link widoczny dla zalogowanych], NN) the thickness of the oxide layer was thin in the K-sample (KP, KN), from the dense oxide layer and the adhesion with the substrate point of view, is better than K-type alloy. for the diagram (right) Comparison of the distribution of alloying elements, K-type specimen high content of oxide in the Ni, Cr and Si content is minimal, while the N type specimens in the Nj repeated low level of oxidation (peak less), lower than the matrix content,[link widoczny dla zalogowanych], and Cr, Si were higher in the NP si very Taijin in alternating peaks and the peak distribution of Cf, the other pole in the NN alloy clearly see that Mg exists in the oxide layer. the x-ray diffraction of precipitates of alloying elements are distributed line scan (right) considered together, that corresponds to the distribution of the oxides of interest in the line of scan lines in the peak position. At the same time can be seen, N-type thermocouples Taijin repeated the phase distribution of oxidation and phase content compared with the K-shaped specimen great changes have taken place, such as N-type Taijin side of the oxide CrzOa, SiO significantly increased, NiO reduction, and CrO, and SiO were alternately distribution. on the table in case the oxidation of the matrix analysis shows that, K-type alloy in particular, KN most serious along the alloy grain boundaries of the internal oxidation zone, while the N-type Taijin in to observe this phenomenon. IV, N-type alloy high temperature oxidation mechanism of the calculation of thermodynamic data obtained by the Ni, Cr, si oxide partial pressure and temperature relationship, the basis of this relationship can be considered, NP Taijin under certain conditions, will give priority to the surface of SiO:, and then followed by the formation of croa and Ni0, SiO, and CrO. alternately formed, and the formation of volume With the alloy Cr, Si content increasing Li added that these were formed in the surface of CrO. and SiOJ proliferation of high-temperature oxidation to form a potential barrier + Ni0 and effectively inhibited the production of internal oxidation.'s NN for N thermocouple very co-barrier, Si content to enhance and add a small amount of Mg alloys to improve oxidation resistance of the thermoelectric power and stability. Mg si antioxidant properties and to improve the role of a certain phase Qiang belly, which can be made with Burley, who mechanism to explain】. V. CONCLUSIONS N type thermocouple alloy high temperature oxidation resistance is better than K-type alloy, which should be attributed to N-type Taijin in Crz0s, SiO: and MgO on the high temperature oxidation process, hindering the spread of . In the Cut ashamed provided in Huangshi Di Comrade X-ray phase analysis data, special shoes, thanks. References 1 Zhang Ping. Nicrosil-Nisll thermocouple combined thermal barrier passivation. Instrument Materials .1 gST.i8 (5): 2gT ~ co-resistance N-type thermocouples 2ggBurleyNA.M thermal stability of the ring box. temperature and control the amount of Sa-I Shu (below). Beijing: China Metrology Publishing House .1985 secluded wood families i file 9 Peru (Ding Ding l4
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