本文主要為探討利用氬銲被覆陶瓷粉末及不同合金粉末於球墨鑄鐵表面之磨耗行為研究，主要以SiC陶瓷粉末為基礎粉末，並添加Cr、Mo、Ni等元素粉末，以探討不同元素對被覆層的影響，並藉由被覆層中的顯微組織及成分等冶金條件，利用各式分析儀器，FE-SEM(場發射掃描式電子顯微鏡)、維克氏硬度試驗機、EPMA(電子微探針儀)、X-ray繞射儀進行各種分析，以找出影響耐磨耗能力的因素，此外，並以Ti粉末與TiC陶瓷粉末添加Ni元素粉末做為比較組，了解不同粉末對被覆層的影響差異。
研究結果顯示，SiC系列被覆層屬於析出強化型，主要析出相為Fe3C，而被覆Ti與TiC-Ni被覆層以TiC為強化相，另外在有添加Ti的被覆層中，會有臨場形成(in-situ)TiC強化相產生。在磨耗試驗結果顯示，Ti與TiC系列被覆層的耐磨耗能力明顯的優於SiC系列之被覆層，這歸因於兩者強化相的分佈型態與成長方向不同所致；SiC系列被覆層在經過225°C回火處理後，SiC-Cr被覆層之磨耗量在經回火處理前後之差異較小，磨耗量較為穩定；而SiC-Ni被覆層在經過回火處理後，耐磨耗能力是最差的；但在高滑動速度條件下，經回火處理後之SiC系列被覆層有較高之磨耗量。

整體而言，兩種不同系列的被覆層均能有效的提升基材硬度，對耐磨耗能力都有一定程度之提升。

In this thesis, ceramic powders and ceramic powders mixed with different alloy elements were cladded on ductile iron surfaces by gas tungsten arc welding(GTAW) process to investigate the wear behavior of the clad layers. SiC was the basal powder, and the elements of Cr, Mo and Ni were added to discuss the differences of the clad layer by different elements, which includes microstructure and composition in clad layer. Microstructures of the clad layers were analyzed by a field-emission scanning electron microscope (FE-SEM), a Vickers microhardness tester, an electron probe microanalyzer (EPMA) and an X-ray diffractometer (XRD) to find out the major parameter that influence the wear resistance of the clad layer. In addition, the clad layers of Ti and TiC powders added with Ni element were as the compared group to discuss the influences of cladd layers with different powders.

Experimental results show that the series of SiC clad layers is strengthed by precipitation, and the major reinforcement phase is Fe3C; the reinforcement TiC is the major phase of Ti and TiC-Ni clad layers. In addition, the reinforcements TiC is synthesized in-situ in cladd layers by adding Ti element. The wear test results indicate that the wear performance of Ti and TiC-Ni clad layers is better than that of SiC series cladd layers, and which are attributed to both of reinforcement arrangement and growth direction difference. When the series of SiC clad layers is tempered at 225°C, the wear loss for the SiC-Cr clad layer has a tiny difference before and after tempering, and the wear loss is steady; the SiC-Ni cladding layer has the worst wear resistance after tempering at the higher sliding speed. However, the series of SiC clad layers has the higher wear loss. In conclusion, the hardness and wear resistance of SiC, Ti and TiC-Ni clad layers are higher than that of the substrates obviously.

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