激光焊接烤瓷合金试件抗应力腐蚀的实验研究  

Stress-corrosion Test of Laser Welded Ceramic Alloys

作　　者：黎红[1] 付强[2] 赵云凤[2] 肖茂春[2] 疏新红[3] 潘英[4] 

机构地区：[1]西南交通大学摩擦学研究所博士后流动站 [2]华西医科大学口腔医学院,610041 [3]成都市第三人民医院 [4]中国核动力研究院

出　　处：《华西口腔医学杂志》2000年第2期116-118,共3页West China Journal of Stomatology

摘　　要：目的 :探讨激光焊接的非贵金属烤瓷合金的抗应力腐蚀性能。方法 :激光焊接 10对CW PA试件 ,随机取 5对作对照 ,不做任何处理 ,另 5对试件在 37℃人工唾液中承受 2 6 1 44MPa应力加载 ,做应力腐蚀实验 ,3月后观察表面显微裂纹 ,测试抗拉强度。结果 :激光焊接组抗拉强度 5 0 2 48± 12 49MPa ,对照组为 44 6 0 5± 82 5 0MPa ,差异无统计学意义 (P >0 0 5 ) ;两组试件表面均无显微裂纹。结论 :激光焊接的烤瓷合金具有良好的抗应力腐蚀性能。Objective:The corrosion properties of dental material are very critical. This study is to investigate the corrosion properties of laser welded basemetalalloys. Methods: The precise stainless rod molds had been made in size of Φ3 mm×4 mm, with which 20 wax patterns were made.They were invested with inner investment (Bellavest) and outer investment (phosphate and gypsum). Then they were casted with CW PA (Ni Cr Nb) alloys. All casted alloy rods were ultra sonic washed in distilled water. Every two rods were contacted longitudinally by a special welding jig. Laser welding machine (DL 2002) was used to weld them at 305 V, 20 ms. The specimens were divided into 2 groups as following: ①The group of stress corrosion: 5 laser welded samples were subjected to the stress corrosion test under 261 44 MPa in the 37℃ artificial saliva for 3 months in a special stress corrosion test jig. After that, the ultimate tensile strength (UTS) was tested, the surface microcrack at the fusion zone (FZ), the heat affecting zone (HAZ) and the interface zone was observed with SEM (AMRY 1845, USA), the elements were also analyzed with EPMA (AMRY 1845, USA) at the fusion zone (FZ), the parent metal zone and the interface zone. ②The other 5 laser welded samples were made as the controlled group. No special treatment were done to them, and the UTS was also tested, the surface of the micro crack and the elements at the FZ, the HAZ, parent metal zone and the interface zone were observed and analyzed with SEM, EPMA as well. Results: The study showed us that the UTS of the stress corrosion group was 502 48±12 49 MPa, while that of the controlled group was 446 05±82 50 MPa, there was no significant difference (P>0 05). There was no microcrack on any sample′s surface at the FZ, the HAZ and the interface zone. The main elements of the FZ were Ni(56 63%), Cr(19 36%), Nb(6 57%), Si(6 01%), Al(0 32%) and Mo(11 11%), while the elements of the parent metal zone were Ni(60 77%), Cr(20 59%), Nb(5 03%), Si(3 95%), Al(0

关 键 词：激光焊接 应力腐蚀 金属烤瓷 

分 类 号：R783.2[医药卫生—口腔医学]