GJB 9577-2018 (English Version)

Standard No.: GJB 9577-2018
Language: Chinese, Available in English version
Release Date: 2018
Published By: Military Standard of the People's Republic of China-General Armament Department
Latest: GJB 9577-2018

Introduction

Interpretation of the core content of the standard

This specification specifies the requirements for the chemical composition, physical properties and appearance quality of seven types of titanium alloy powders, including TA2GELI and TC4, for additive manufacturing processes such as selective laser melting and electron beam melting. Among them:

Performance dimensions	Class 1 powder	Class 2 powder	Class 3 powder
Applicable processes	Laser melting deposition	Electron beam selective melting	Laser selective melting
Particle size range (μm)	45-180	45-105	≤60
Tap density (g/cm³)	>2.6	>2.7	>2.6

Key technical requirements

Chemical composition control

The standard strictly stipulates key indicators such as oxygen content ≤0.25%, nitrogen content ≤0.05%, etc., to ensure that the powder purity meets aviation-grade application requirements.

Physical property classification

According to the fluidity (20-40s/50g) and sphericity (≥75%) indicators, powders are divided into three categories, including:

Class 1 powder: suitable for deposition of large-size parts
Class 2 powder: dedicated to electron beam process
Class 3 powder: preferred for high-precision laser forming

Implementation points

Quality inspection process

After sampling according to GB/T 5314, the following needs to be completed:

GB/T 4698 chemical composition analysis
Laser diffraction particle size test (GB/T 19077.1)
Hall flowmeter fluidity test

Packaging and transportation specifications

Requires the use of double-layer protection:

Inner layer: 0.1mm polyethylene vacuum packaging
Outer layer: stainless steel barrel + cushioning material

Technology evolution analysis

Compared with the 2015 trial version, this standard:

Added 3 new low-temperature alloy grades including TA7ELI
Refined the sphericity detection method
Clarified the powder matching principles for different processes

GJB 9577-2018 history

2018 GJB 9577-2018 Specification for titanium and titanium alloy powders for additive manufacturing