臺灣博碩士論文加值系統

改良式熱反應沉積擴散是於低壓流體床內實施。本研究是採非接觸法，活化劑周期地加入合金粉末中用以產生提供處理所需之氣氛。處理之冷作工具鋼AISI D2試片懸掛於流體床上方，壓力介於6.7×102 Pa ~ 5.3×104 Pa，可大量減少流體床化氣體，亦大幅擴大處理空間。反應動力學之研究亦由實驗中證明活化劑添加可有效降低活化能。當藉由雙重處理(以熱反應沉積擴散形成碳化物再經電漿滲氮)形成之氮化鉻層更提高了只經熱反應沉積擴散形成之碳化物層之耐磨耗性。

A modified TRD (Thermoreactive Deposition / Diffusion) has been investigated in a low pressure fluidized bed furnace in this study. The steel specimens AISI D2 were positioned above the surface of the alloying powder. The activator was periodically introduced into the alloying powder to provide the working atmosphere for the required process. Since the pressure of the retort was maintained between 6.7×102 Pa and 5.3×104 Pa, the consumption of fluidized gas (argon) was reduced significantly. A modified TRD also significantly increased the working space of the treating zone. Furthermore, the kinetics of reaction K = K0 exp(-Q/RT) was empirically determined in this study. It is shown that the activator, NH4Cl, can effectively lower the activation energy Q, as well as enhance the formation rate of the carbide layer.
The chromium nitride obtained from TRD followed by plasma nitriding (dual treatment) provides more resistant than that of the solely TRD treated one.

摘要 I
Abstract II
Table of Content III
The List of Table V
The List of Figure VI
1. Introduction 1
2. Literature review 5
2.1 Chromium carbide coating 5
2.2 Carbide forming elements and nitride forming elements 6
2.3 Applications of chromium diffusion coatings 7
2.4 Diffusion of chromium in an alloy 9
2.5 Interaction of metal with a gaseous medium 9
2.6 The process of formation of a diffusion layer on chromizing 11
2.7 Method of chromizing 12
2.7.1 Vapor phase method 12
2.7.2 Gas method of diffusion chromizing 13
2.7.2.1 Contact technique of gas method of diffusion chromizing 13
2.7.2.2 Contact-free technique with simultaneous generation of chromizing gas 15
2.7.2.3 Contact-free technique of gas chromizing with chromium-halide salts 16
2.7.3 Liquid method of diffusion chromizing 16
2.8 Plasma nitriding 19
2.9 CrN coating 20
2.10 Wear mechanism 21
2.10.1 Adhesion wear 21
2.10.2 Abrasion wear 22
2.10.3 Surface fatigue wear 23
2.10.4 Tribochemical reaction wear 24
3. Experimental details 25
3.1 Preparation of specimens 25
3.2 Experimental facilities 26
3.3 Experimental conditions and procedures 26
3.4 Wear resistance test 28
3.5 Coated layer analysis 29
4. Results and discussion 31
4.1 Effect of chromium powder and activator addition of TRD 31
4.2 Characterization of the carbide layers of TRD 34
4.2.1 Element distribution and structure analysis 34
4.2.2 Hardness of chromium carbide layer by TRD 35
4.3 Potential gradient of atmosphere in the furnace of TRD 35
4.4 Effect on the carbide layer growth mechanism of TRD 37
4.5 Characterization of dual treatment 39
4.5.1 Coated layer structure of dual treatment 39
4.5.2 Hardness of CrN layer 41
4.6 Wear properties 41
5. Conclusions 45
References 47

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