GB/T 43765-2024
Aerospace functional coating layer Particle reinforced metal matrix composite welding coating layer (English Version)

Standard No.

GB/T 43765-2024

Language

Chinese, Available in English version

Release Date

2024

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China  CN  /  GB

Latest

GB/T 43765-2024

Introduction

GB/T 43765—2024 Interpretation of Technical Specifications for Aerospace Functional Coatings and Particle-Reinforced Metal Matrix Composites Welding Coatings

Project Dimensions	Specific Requirements	Scope of Application
Coating Structure	The bottom coating is made of copper or nickel, and the surface coating is made of lead-tin, gold or chemical nickel.	Applicable to materials such as aluminum-based silicon carbide and copper diamond.
Thickness Requirements	The total thickness ranges from 7 to 25 microns, and the surface coating thicknesses are 1.5 to 3 microns (gold), 7 to 10 microns (lead-tin) and not less than the requirements.	Determine the specific value according to product requirements.
High temperature resistance	Gold plating: 350°C; lead-tin alloy: 150°C; nickel plating: 350°C.	Ensure stability and reliability at extreme temperatures.

Case Study: Plating Application in Spacecraft Electronic Packaging

In spacecraft electronic packaging, particle-reinforced metal matrix composites (such as aluminum-based silicon carbide) are often required to work in high temperature and high humidity environments. According to the requirements of GB/T 43765-2024 standard, it is crucial to select the appropriate plating structure.

For example, in the packaging of a spacecraft navigation system, a gold plating layer was selected as the surface plating layer (thickness of 1.5~3 microns) and matched with a copper bottom plating layer. The adhesion strength and solderability of the plating layer at 220°C were verified through high temperature resistance tests and normal pressure thermal cycle tests.

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Technical Background and Standard Formulation

This standard was drafted by the National Technical Committee for Standardization of Aerospace Technology and Its Applications, and aims to meet the use requirements of spacecraft in extreme environments. By integrating advanced plating technologies at home and abroad, the high temperature resistance, corrosion resistance and solderability of the material are ensured.

Implementation Suggestions

1. During the production process, the coating thickness and adhesion strength should be tested strictly in accordance with the parameters specified in the standard. 2. For key components, it is recommended to use alternative specimens for pre-testing to ensure product quality consistency. 3. Strengthen the metrological management of inspection equipment and calibrate it regularly to ensure measurement accuracy.

GB/T 43765-2024 Referenced Document

• GB/T 13979 Mass spectrometer leak detector
• GB/T 16745 Standard test method for solderability of metallic-coated products
• GB/T 16921 Metallic coatings.Measurement of coating thickness.X-ray spectrometric methods
• GB/T 2423.4-2008 Environmental testing for electrical and electronic products - Part 2: Test method Test Db alternating damp heat (12h + 12h cycle)
• GB/T 2828.1 Inspection procedure by count sampling part 1: Lot by lot inspection sampling plan retrieved by acceptance quality limit (AQL)
• GB/T 3138 Metallic and other inorganic coatings.Surface treatment, metallic and other inorganic coatings.Vocabulary
• GB/T 33864 General specification for mass spectrometer
• GB/T 34522 Thermal vacuum test method for spacecraft
• GB/T 34558 Terminology for metal matrix composites
• GB/T 6462 Metallic and Oxide Coatings - Thickness Measurement - Microscopy Method*， 2025-10-31 Update

GB/T 43765-2024 history

• 2024 GB/T 43765-2024 Aerospace functional coating layer Particle reinforced metal matrix composite welding coating layer

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