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    Basic Information

Technology developed: Bimodal Structure Based Thermal Barrier Coating Composition, Process for Preparation Thereof, and Su (TP19768077447)
Category: Technology Service/Know how
Details of Inventor(s):
Inventor Institution/Organization/Company Department Designation
Alok Bhadauria IIT Kanpur Material Science and Engineering Post Doc Student
Ashutosh Tiwari Rajkiya Engineering College Banda Professor
Shipra Bajpai IIT Kanpur Material Science and Engineering Ph.D. Student
Ambreen Nisar IIT Kanpur Material Science and Engineering Post Doc
Anup Kumar Keshri IIT Patna Professor
Kantesh Balani IIT Kanpur Material Science and Engineering Professor
Technical Application Area: Manufacturing
If 'Other', please specify:
Please give more details of new technical application area:
Organization(s):
Indian Institute of Technology (IIT) Kanpur
Affiliated Ministry: Ministry of Education
Type of technology development: Indigenous
Does the technology help in replacing any import items currently
procured from outside India?
Yes
Does the technology have export potential? Yes
Category of Technology developed: Immediate Deployment
Stage of Development: Lab-scale
Please describe in detail including the TRL Level:
The plan is being executed

    Abstract:

Applications: Plasma sprayed alumina is an ideal material for top-coat of thermal barrier coatings owing to its low thermal conductivity and low coefficient of thermal expansion. However, its poor mechanical properties result in the coating failure due to delamination. Herein, a novel methodology is introduced to improve the mechanical properties of top-coat where bimodal microstructure (nano region to micro region) in the plasma sprayed coating is designed via spray drying of nano alumina with Yttria stabilized Zirconia (8YSZ) and Carbon Nanotubes (CNT) reinforcement prior to plasma spraying. Increased hardness and fracture toughness by around 57 percent with bimodal microstructure is observed leading to enhanced structural integrity.
Advantages: Thermal barrier coatings are widely used in the hot sections of the gas turbine engines to protect the metallic parts at the service temperature (1000 C). Poor fracture toughness of alumina may lead to the catastrophic failure of the coatings due to rapid crack propagation. Spray drying of nano alumina along with the reinforcements of 8YSZ and CNTs enhances the fracture toughness of the micro alumina coatings due to crack deflection, crack termination, crack bridging and CNT pullouts phenomenon. Improved mechanical properties (hardness and fracture toughness) enhances the structural integrity of the coatings and thus delayed failure. Therefore, the potential use of this invention or methodology is in providing the thermal insulation to the hot sections of gas turbine engines without delamination.

    Technology Inputs:

Imported Equipment/Spare Parts:
Equipment/Spare Parts Year ITC-HS Code
NA
Indigenous Equipment/Spare Parts:
Equipment/Spare Parts Year ITC-HS Code
NA
Imported Raw Materials:
Raw Materials Year ITC-HS Code
NA
Indigenous Raw Materials:
Raw Materials Year ITC-HS Code
NA
Existing R&D Facilities used:
Facilities Year ITC-HS Code
NA

   Patents & Publications:

Patents:
Filed Patents (No.) Granted Patents (No.) Year
1 0 2020-21
Publications:
Submitted (No.) Published (No.) Year
0 1 2020-21

    Commercialization Potential:

Who are the Potential Licensees? Praxair Surface Technologies, Metallisation Ltd, TST Engineered Coating Solutions, Air Products and Chemical Inc.
What commercially available products address
the same problem?
Company Product Problem Addressed
Would you like to develop this invention further with
corporate research support?
Yes
Would you be interested in participating in cluster based
programs for commercialization research or business
planning for your invention?
Yes
      Submitted by: J.G. Rao Date of Submission: 5-5-2022



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