臺灣博碩士論文加值系統

本研究之主要目的在於探討矽粉添加量與燒結溫度對303LSC燒結不銹鋼之燒結性、機械性質、耐蝕性與抗高溫氧化性之影響，此外研究振動珠擊對耐蝕性的改善效果。試驗結果發現燒結合金之尺寸收縮率、燒結密度、硬度與耐蝕性會隨矽粉添加量之增加而提高。原因為矽粉與不銹鋼粉末產生反應而形成共晶液相，此液相於凝固時轉化為肥粒鐵固相，使燒結合金由原本的單相變態成具有沃斯田鐵相與肥粒鐵相之兩相不銹鋼。另一方面振動珠擊降低燒結合金表面之孔隙率與接觸面積，而提高燒結合金之耐蝕性。高溫氧化試驗使用600℃與800℃兩種溫度於大氣中進行，探討矽粉添加量增加與振動珠擊對高溫氧化性之影響。試驗結果發現抗高溫氧化性會隨著矽粉添加之增加而提高，但振動珠擊在600℃時反而增大其氧化量。至於在800℃之抗高溫氧化性來說，振動珠擊並沒有顯著地影響。
另外將燒結合金進行800℃之析出處理，時間為10至2000分鐘。試驗結果顯示當析出時間超過10分鐘以上時，於燒結合金內部會析出硬脆之σ相。而此相會隨著析出時間之增長，其形態會產生明顯地改變。針對析出σ相之燒結不銹鋼進行腐蝕、硬度與衝擊試驗，結果發現σ相析出對硬度值有明顯地提升作用，但卻造成耐蝕性與韌性之下降。

The objectives of this work are to investigate the effects of silicon powder addition and sintering temperature on the sinterability , mechanical properties , corrosion and oxidation resistance of sintered 303LSC stainless steels. Influence of vibratory ball-peening on the corrosion and oxidation resistance is also studies. The sinterability , mechanical properties and corrosion resistance are increased with increasing amount of the silicon powder addition. The improvement is resulted from the increasing ferrite content induced by introducing of more silicon powder and the decreasing surface area of the well-sintered alloys. Cold work with vibrator ball-peening closed small surface pores and reduces the surface area profoundly. The oxidation resistance at 600℃and 800℃ in air increases with increasing silicon powder addition. The oxidation resistance of sintered alloys at 600℃ is decreased by the treatment of vibrator ball-peening , but no appreciable degradation is found at 800℃.
Hard and brittle sigma phase precipitates when the sintered alloys are aged at 800℃ , the aging time varies 10 of 2000 minutes. The sigma phase precipitates when the aged times was over 10 minute. Morphology of the sigma phase depends on the aging times. Hardness and increased with increasing aging time , but the corrosion resistance and toughness was decreased.

中文摘要………………………………………………………………………………..i
英文摘要………………………………………………………………………………..ii
誌謝………………………………………………………………………...…………...iii
目次…………………………………………………………………………..…………iv
表目錄……………………………………………………………………….………….vi
圖目錄………………………………………………………………………………….vii
第一章 緒論…………………………………………………………………………..1
第二章 粉末製取與成形……………………………………………………………..4
2.1前言……………………………………………………………………………4
2.2常用粉末製取技術……………………………………………………………4
2.3粉末製取之後續處理…………………………………………………………7
2.4粉末成形法……………………………………………………………………9
第三章 燒結現象與理論…………………………………………………………….11
3.1固相燒結……………………………………………………………...………11
3.2液相燒結……………………………………………………………….……..17
3.3活化燒結……………………………………………………………………...20
第四章 實驗方法…………………………………………………………………….23
4.1實驗材料與試件製備…………………………………………………………23
4.2試件分析與性質測試………………………………………………………...26
第五章 試驗結果與討論……………………………………………………….……28
5.1矽粉添加對燒結行為之影響………………………………………….……..28
5.2矽粉添加對燒結密度之影響………………………………………….……..33
5.3矽粉添加對合金硬度之影響………………………………………….……..37
5.4腐蝕試驗……………………………………………………………….……..40
5.4.1矽粉添加對耐蝕性之影響……………………………………….…...40
5.4.2矽粉添加對合金表面形態之影響…………………………...…….…44
5.4.3冷加工量對耐蝕性之影響…………………………...……….………51
5.5氧化試驗……………………………………………………..………….……52
5.5.1矽粉添加對抗氧化性之影響…………………………………....……52
5.5.2冷加工量對抗氧化性之影響…………………………………………53
5.6 σ相之析出及其對合金性質之影響………………………………………..56
5.6.1σ相析出之研究……………………………………………………….56
5.6.2σ相析出對合金密度之影響…………………………….……………60
5.6.3σ相析出對合金硬度之影響………………………………………….63
5.6.4σ相析出對耐蝕性之影響…………………………………………….65
5.6.5σ相析出對衝擊值之影響…………………………………………….68
第六章 結論………………………………………………………………………….70
參考文獻……………………………………………………………………………….72

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