|Table of Contents|

Study on uniformity control of nickel coating for injector brazing(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2020年05期
Page:
94-101
Research Field:
工艺与材料
Publishing date:

Info

Title:
Study on uniformity control of nickel coating for injector brazing
Author(s):
QUAN Linlin; ZHAI Huifeng; YE Hui
(Xi’an Space Engine Company Limited,Xi’an 710100,China)
Keywords:
injector;  brazing;  profile anode;  coating thickness;  current density;  uniformity
PACS:
V463
DOI:
-
Abstract:
In order to improve the brazing qualification rate of a certain type of engine injector, the thickness distribution and uniformity of the nickel coating which affects the quality of the injector brazing were studied.Through the test of the injector simulation, the data of the thickness distribution of the coating in the hole of the injector under different size profile anode and the current density distribution of the electroplating process were obtained.According to the structure characteristics of the injector, a special profile anode and the cathode-anode spacing were designed during the plating process.The test results show that when the profile anode(outer diameter 170 mm, inner diameter 120 mm)and the cathode-anode spacing are controlled at 50 mm, the thickness of the injector hole can be controlled within the range of 4～9.5 μm, which satisfies the product brazing and the uniformity of coating thickness was effectively controlled.The air-tightness test results of 2 MPa and 10 min were qualified after the brazed injector, and no leakage occured.Through suitability and stability of multiple products, the optimized electroplating process has a good stability, the product has passed the test and flight assessment.

References:

[1] 黄立德.发动机制造技术[M].北京: 宇航出版社, 1990.
[2] 高禄, 栗卓新, 李国栋, 等.铜-钢异种金属焊接的研究现状和进展[J].焊接, 2006(12): 16-19.
[3] 王厚勤, 曹健, 张丽霞, 等.铜合金与钢连接技术研究进展[J].焊接技术, 2009, 38(3): 1-5.
[4] 张允诚, 胡如南, 向荣.电镀手册[M].北京: 国防工业出版社, 2011.
[5] 郭鹤桐,陈建勋,刘淑兰.电镀工艺学[M].天津:天津科学技术出版社,1985.
[6] 宋凉, 刘兴斌, 叶晖.TaW10表面镀覆工艺[J].火箭推进, 2009, 35(1): 54-58.
SONG L, LIU X B, YE H.TaW10 surface plating process[J].Journal of Rocket Propulsion, 2009, 35(1): 54-58.
[7] 安茂忠, 屠振密.电镀Zn、Cu、Ni、Cr及其合金的研究进展[J].电子工艺技术, 2001, 22(1): 5-9.
[8] 黄可迪, 冯艳, 马如龙, 等.Co和P对Ni-金刚石复合电沉积机理的影响[J].有色金属科学与工程, 2017, 8(6): 43-50.
[9] 徐明丽, 张正富, 杨显万, 等.钯及其合金电镀的研究现状[J].材料保护, 2003, 36(10): 4-8.
[10] 安然, 魏磊, 李怡莹, 等.电镀条件对CoP非晶镀层催化活性的影响[J].表面技术, 2017, 46(10): 143-148.
[11] 马跃宇, 徐秀芝, 魏绪钧.锌镍合金电镀技术的研究[J].腐蚀与防护, 1998,19(4): 158-159.
[12] 杨战争, 翟绘丰.金属密封件镀金工艺研究[J].火箭推进, 2013, 39(6): 60-64.
YANG Z Z, ZHAI H F.Gold plating technology of metal seal[J].Journal of Rocket Propulsion, 2013, 39(6): 60-64.
[13] 杨战争, 吕广庶, 蔡刚毅.Ni-P-纳米金刚石化学复合镀研究[J].电镀与涂饰, 2006, 25(10): 5-7.
[14] 赵文轸.金属材料表面新技术[M].西安: 西安交通大学出版社, 1992.
[15] 周楠, 丁毅, 马立群.Q235钢表面电镀镍及其性能的研究[J].电镀与环保, 2013, 33(1): 4-6.
[16] 杜楠, 付明.提高小型镀铅锡合金焊接件抗氧化性的工艺研究[J].航空精密制造技术, 2012, 48(5): 33-35.
[17] 王力强,郑林斌,梁义东.复杂零件内孔精确镀铬技术研究[J].涂料涂装与电镀,2006,4(6):24-28.

Memo

Memo:
-
Last Update: 2020-10-20