Silicate Coated Build Platform for 3D Metal Printing Release
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Solution Overview
Problem
Three-dimensional metal object printers face challenges in securely adhering the base layer of metal objects to the build platform without causing damage during removal, due to high oxidation levels and uneven bonding, which affects stability and porosity.
Innovation Solution
A method involving the application of a silicate layer on the build platform using an applicator, followed by ejecting melted metal drops onto the silicate-coated surface, which promotes reactive wetting and bonding while preventing excessive attachment, allowing for uniform adhesion and easy separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the build platform surface is highly oxidized to prevent excessive bonding, then object removal becomes easier, but the base layer adhesion becomes non-uniform and porosity increases
Solution Approach 1:
The patent introduces an oxidized layer as an intermediary between the build platform and the base layer. This oxidized layer acts as a mediator that provides controlled, uniform bonding strength - strong enough to adhere the base layer uniformly during printing, but weak enough to allow clean removal of the finished object. The oxidation is deliberately applied to create a consistent surface chemistry that prevents both excessive bonding and non-uniform adhesion.
2Strength
If the build platform surface is clean to ensure strong base layer bonding, then object stability improves, but object removal causes damage to the object or platform
Solution Approach 1:
The patent converts the typically harmful oxidation process into a beneficial feature. Instead of viewing oxidation as a contaminant to be avoided, the invention deliberately applies oxidation to create a controlled interface layer. This oxidized layer, which would normally be considered a defect or harmful factor, is actually the key to achieving both strong initial bonding and clean subsequent removal. The oxidation is applied in a controlled manner to provide the right balance of adhesion and release properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The silicate layer ensures uniform adhesion and appropriate porosity of the base layer, enabling stable object formation without damaging the object or the platform during removal, by controlling the bonding intensity and creating a fracture plane for easy detachment.
Implementation Method 1
promotes reactive wetting and bonding
Implementation Method 2
The high temperature of the surface of the build platform can cause the surface of the build platform to become very highly oxidized. This oxidation layer can interfere with the adherence of the object base layer to the build platform
Implementation Method 3
An electrical current is passed through the coil to produce an electromagnetic field that causes the meniscus of the melted metal at a nozzle of the receptacle to separate from the melted metal within the receptacle and be propelled from the nozzle
Data Source
AI summary
A three-dimensional (3D) metal object manufacturing apparatus is equipped with a liquid silicate application system to apply liquid silicate to a surface of a build platform prior to manufacture of a metal object. The liquid silicate layer is permitted to air dry and then the platform is heated to its operational temperature range for formation of a metal object with melted metal drops ejected by the apparatus. The liquid silicate layer forms a glassy, brittle layer on which the metal object is formed. This brittle layer is removed relatively easily with the object after the object is manufactured and the build platform is permitted to cool. The silicate layer improves the wetting of the surfaces of build platforms made with non-wetting materials, such as oxidized steel, while also preventing metal-to-metal welds with wetting materials, such as tungsten or nickel.