Atect Full-Mould binders FullFull-Mould
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Elemental Technologies
The BINDER for thermal debinding systems, capable of being recycled up to 10 times! • • • • •
Just regrind the sprue, runner and unwanted green parts then reuse! Use 100% reground material without the need for fresh feedstock! No change in the shrinkage ratio or physical properties! No change in mouldability! No need to modify debinding and sintering setup!
Binder system design
Binder System Design
Characteristics required for Binder High flowability at molding temperature
Binder design considering the viscosity at around the molding temperature.
High expansion property in the mold during injection moulding Wide moulding condition range because of the Barus Effect. (Fig.1 and 2)
High thermal decomposition property in the de-binding process There is no effect on the sinter quality, because there is no residue after de-binding. (Fig.3)
The flow amount F, when the load S is applied to the thermoplastic fluid, is given as following equation.
Here, a is the flow characteristic at load=1, n is Barus effect.
Barus effect Image of flow behavior Impact on the injection process
Jetting
(cause of welding)
Cloud, Sink
(cause of dimensional error)
Good product
Fig.1 Schematic of the relationship between n value and flow characteristic ※Since larger n value, material expands in the mould, dense green part is obtained.
■：use other company’s binder ◆：atect MIM Feedstock
Fig.3 TGA Curve of Binder ※All components are vaporized at around 500℃.
atect corporation 3275-1 Kamihaneda Higashiohmi Shiga Tel: 074-820-3400 Fax: 074-820-3401 36 Powder Injection Moulding International
Fig.2 Flow characteristic compared with pellets using the other company’s binder
※With our binder, it is possible to obtain precise green part because material easily expands in the mould.
www.atect.co.jp Email :pimsales@atect.co.jp takehiko.kitamura@atect.co.jp © 2020 Inovar Communications Ltd Vol. 14 No. 2 June 2020