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Characterization of airtightness and sealing of FDM materials #38

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aaronreichmenberliner opened this issue Jan 28, 2018 · 2 comments
Open

Characterization of airtightness and sealing of FDM materials #38

aaronreichmenberliner opened this issue Jan 28, 2018 · 2 comments
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@aaronreichmenberliner @miamirkovic
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crucible documentation fabrication hardware

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@aaronreichmenberliner
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First set of tests.

  1. Design and print test part.
  2. Qualitative test part in autoclave.
  3. Weight part and install SW3dPS-6092-2TFBM400 brass adaptors
  4. Evaluate airtightness with pump
  5. Vacuum infiltration and re-evaluate airtightness.
@aaronreichmenberliner
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aaronreichmenberliner commented Jan 30, 2018 •
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Protocol

Baselining

  1. Determine the mass of the parts by weight. Measure some set of dimensions. Weigh 3D printed parts to determine initial mass. Compare with calculated mass from CAD by subtracting the measured mass from the calculated mass to get mass of porosity mp. Calculate the volume of porosity Vp using the mass of porosity mp and material density rho. Determine infiltration time t from porosity Vp and infiltration time X.

  2. Evaluate sealing. Fit part to pressure rig. Apply rubber stopper to hole. Apply grease to o-ring. Apply vacuum for 10 minutes. Measure pressure. Turn off vacuum and wait 10 minutes or until pressure is lost. Record time. Calculate leak rate. Repeat 5x times.

  3. Complete Vacuum Infiltration Vacuum Infiltration of Crucible Chamber using BJB TC-1614 #53

  4. Weight epoxy-treated parts to determine final mass. Calculate the increase in porosity. Measure dimensional change by remeasuring some set of dimensions.

@aaronreichmenberliner
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Weighted Parts

  • Spiral Top: 234.4 g
  • Spiral Bottom: 202.5 g

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@aaronreichmenberliner @miamirkovic