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Simulation on Brazing Sapphire to Stainless Steel With and Without Woven Metal Interlayer
21
Transcript
Simulation on
Brazing Sapphire to Stainless Steel With and Without
Woven Metal Interlayer
Literature Review
Mohamad Azam Zainondin
17190885/2
Introduction
INTRODUCTION
- Brazing: Joining two materials (similar or dissimilar) using heat and filler metals which have a melting temperature of above 450 degree Celsius (Humpston et al., 1994).
- heating the materials to melting point of the filler metal to ensure that molten filler flows between the two mating surfaces via capillary action.
- Sapphire is an anisotropic, rhombohedral crystalline form of aluminium oxide (Al2O3).
- Stainless steels often in product designs for their:
- resistance to corrosion
- retention of strength
- resistance to scaling at high temperatures
- stability at very low temperatures
- cleanliness and smooth finishes
- Two layers of brazing fillers:
- main layer
- interlayer
Problem Statement
Problem Statement
- There is a need for improvement in one of the most distinctive features of brazing, the ability to form thermally-stable joints between dissimilar materials. (Way et al., 2020).
- In high temperature brazing of ceramic to metal, there is a great possibility of post-process cracking and joining failures to occur, resulting from CTE mismatch between ceramics and metals (Hamdi et al., 2013).
- Successful joining between sapphire/Inconel 600 at high brazing temperature. However, the joining failed at low brazing temperature due to high residual stresses with the presence of Cu/Ni porous interlayer (Zaharinie et al., 2014).
- Limited research conducted pertaining to the woven metal as a brazing interlayer.
- Current interest:
- implementation of woven metal interlayer in brazing of sapphire/stainless steel,
- the effect of residual stresses on the joint,
- methods to form and improve thermally-stable joints.
Objectives
- To simulate the brazing of sapphire to stainless steel with and without woven metal interlayer.
- To investigate the effect of residual stress on the brazed joints for the brazing of sapphire to stainless steel with and without woven metal interlayer.
Methodology
Key Findings
- Major benefit of brazing: Joining dissimilar materials with minimal alteration.
- Importance of choosing the right brazing parameters.
- Importance of choosing the best filler metal.
- Common joining method between ceramics and metals: Using filler metals containing Ag, Cu and Ti.
- Role of interlayer in brazing procedure.
- Porous and woven metals as interlayer.
LITERATURE REVIEW
- The size of sapphire sample compared to a 20 cent coin.
METHODOLOGY
- The size of 316L stainless steel sample compared to a 50 cent coin.
- 304 stainless steel woven wire mesh cloth cut into 18 x 18 mm dimension.
List of properties for selected materials.
List of properties
Design of brazing arrangement for simulation:
PRELIMINARY RESULTS
Preliminary Results
Theoretical Thermal Residual Stresses:
Theoretical thermal residual stresses
Expected results from simulation:
WORK PLAN
Research work plan for FYP II Semester 2, 2021/2022.
Work Plan
Research work plan for FYP I
Semester 1, 2021/2022.
FYP 1
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