Fraunhofer ISC, Center for High Temperature Materials and Design HTL, BayreuthCompleted funded project
Motivation
The use of classic steel screws is limited
- Use of classic steel screws is limited
- Development of ceramic screws
- Applications: chemical industry, mechanical and plant engineering, aerospace, forming technology, microtechnology, medical technology
- Advantages of ceramics: high temperature stability, corrosion resistance, non-magnetic, low electrical conductivity, abrasion-resistant
- BUT: brittleness, creep at high temperature, high friction coefficients
- Applications: chemical industry, mechanical and plant engineering, aerospace, forming technology, microtechnology, medical technology
Objective
Superbolt
- Zirconia screw connections for use:
- at high temperatures
- in highly corrosive environments
- under high mechanical loads
- for cyclical thermal load (good TCR, low heat capacity)
- can still be removed even after long periods of standing
- at high temperatures
- Post-processing should be avoided
- CNC manufacturing process
- suitable for small and medium series
- processing in green state
- suitable for small and medium series
- Superbolt made of ZrO2 ceramic
Results
3D-printed ZrO2 screws
- Successful material development of MgO partially stabilised ZrO2
- Optimisation of raw material composition, debinding, sintering
- Material properties comparable to reference material (Z 501)
- Optimisation of raw material composition, debinding, sintering
- Design: Finite element analysis for M10 thread
- Development of a design suitable for ceramics that allows a load that is approximately three times higher than a standard DIN thread
- Prototype production in 3D printing process
- Necessary strength could not be achieved due to manufacturing reasons
- Necessary strength could not be achieved due to manufacturing reasons
- Successful prototype production at project partner BCE using green machining
- 60% higher torsional strength based on ceramic oriented screw design
- Tightening torque for Superbolt (10-14Nm)
- 60% higher torsional strength based on ceramic oriented screw design
Project Data
| Project Duration | 01.06.2014 - 30.11.2016 |
| Sponsor |
Federal Ministry of Economics and Technology (BMWi), Central Innovation Programme for SMEs (ZIM) |
| Funding Amount | 174,500 Euro |
| Project Partners | Fraunhofer-Centre HTL BCE Special Ceramics GmbH |
| Project Coordination | BCE Special Ceramics GmbH |
| Project Management at the HTL |
Marina Stepanyan |
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