本實驗分為兩大主題，第一部分偏重熱效應對複合材料之影響。而磨耗、沖蝕等環境效應之影響，為第二部分探討的議題。
　　Cr3C2/Al2O3複合材料置於空氣中長時間氧化，以壓痕強度法量測R-curve行為，並探討相變化。氧化層包含氧化鋁及氧化鋁/氧化鉻之固溶體，此氧化層經由非破壞性之X光繞射與壓痕等方法量測表面殘留應力，分別為-179 MPa與-195 MPa，與理論計算熱膨脹係數之差異所導致之殘留應力-139 MPa稍有差異。此氧化層明顯能提升裂縫之成長阻力。實驗發現裂縫癒合對裂縫之成長阻力亦有幫助。
　　超音波被用來量測Cr3C2/Al2O3複合材料之熱震性質，傳統水淬火法將試片加熱瞬間掉入水中，以不同頻率之窄頻短正弦波與寬頻脈衝進行試驗，結果顯示超音波性質與淬火溫度有明顯關係，隨著淬火溫度之提高，強度與表面殘留應力逐漸下降。
　　用碳化矽球對Cr3C2/Al2O3複合材料盤進行無潤滑之銷對盤磨耗實驗，發現經燒結過程因顆粒狀強化物與基地熱膨脹係數之差異導致之微裂縫，在整個磨耗破壞機構扮演重要角色。複合材料之磨耗特性確實比單一之Al2O3有提昇之作用，複合材料之移除機構包含有基材與韌化顆粒間之弱界面的破壞、晶粒拉出、顆粒脆裂。一些微研磨與塑性變形亦被觀察。磨耗導致之表面殘留應力為-142 MPa，與經(# 270)鑽石砂輪研磨之表面所導入之殘留應力-158 MPa接近。
承受挾帶沖蝕材高速氣流之衝擊試驗，結果顯示沖蝕率與沖擊角度、沖蝕材顆粒大小、種類及速度有關。其沖蝕機構與損傷也有差異。沖蝕後之殘留強度、沖蝕率與沖蝕導致之表面殘留應力有一致性之變化。
　　承受挾帶沖蝕材高速水流之衝擊試驗，結果顯示沖蝕率與衝擊角度、沖蝕材顆粒大小、壓力有關。燒結過程因顆粒狀強化物與基地熱膨脹係數之差異導致之微裂縫，在整個沖蝕機構亦居關鍵角色。當在壓力500 psi，用碳化矽(# 80)顆粒沖蝕時，複合材之沖蝕面微結構主要包含基面雙晶與差排，這些觀察建議基面雙晶與部分差排有最低臨界分解激發應力。

　　This study focused on investigating the influence of heat and environmental effects on mechanical properties of Cr3C2/Al2O3 composite.
　　The crack resistance (R-curve) of heat treated Cr3C2/Al2O3 composite was studied using the indentation-strength-in-bending technique. The oxidation layer containing alumina and alumina/chromia solid solution was in a compression of 179 MPa and 195 MPa as evaluated by X-ray analysis and indentation method, respectively. The results were slightly different from the thermal mismatch calculation (139 MPa). The relatively compressive, low porous oxidation layer caused significant increase in crack resistance. Crack healing could contribute also partially to crack resistance.
　　The ultrasonic technique is proposed for assessment of thermal shocked damage of Cr3C2/Al2O3 composites. This includes narrowband tone burst and broadband pulse measurements from different frequency. The results reveal the acoustic properties strongly depend on the quenching temperatures. The shock-induced surface residual stresses decreased with increasing quenching temperatures.
　　The wear resistance and fracture mechanisms of Cr3C2/Al2O3 composite were investigated with a pin-on-disk test configuration against a silicon carbide sphere at room temperature in unlubricated sliding. The results suggest that the microcracking induced from residual stresses could play an important role in predicting the wear behavior. Although the addition of Cr3C2 to Al2O3 matrix improved its crack growth resistance, it enhanced the wear resistance. The mechanisms of material removal was related to the failure of the particle-matrix interface, resulting in particle pullout, wear debris and chipping of the matrix. A microabrasive mechanism and microplastic deformation were also observed. The worn-induced surface residual stress (142 MPa) was similar to that induced by #270 diamond wheel grinding (158 MPa).
　　Concerning the effects of erosive particle size and impact angle on the wear rate and surface residual stress, the impact damage behavior of injection moulded Cr3C2/Al2O3 composite was investigated. The experiments were performed using a gas blast erosion rig with SiC and Al2O3 erodents. The results suggest that the larger erodent particles are more effective in displacing and damaging the surface compared to the smaller particles, and lead to higher wear rate and surface residual stress. The variation in surface residual stress with kinetic energy is consistent with the erosion rate and post-erosion strength.
This study has been made of erodent size, liquid pressure and impact angle on wet erosion wear, surface residual stress and impact damage behavior of injection moulded Cr3C2/Al2O3 composites. Spontaneous microcracking induced from sintering process, due to thermal expansion mismatch between alumina and chromium carbide, played a key role in erosion mechanism. Deformed microstructures included basal twins and dislocations were observed when composite erdoded by SiC #80 grit at a water pressure 500 psi. This observation suggests the basal twins and the partial dislocation have the lowest critical resolved stress to activation.

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