GTU BE 8th Semester 2183612 Advanced Ceramics Summer 2018 Question Paper

Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE ? SEMESTER- VIII (NEW SYLLABUS) EXAMINATION- SUMMER- 2018
Subject Code: 2183612 Date:02-05-2018
Subject Name: Advanced Ceramics
Time: 10:30 AM to 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS
Q.1 (a) Define Cermet with examples. 03
(b) What are the basic application areas of cermets? 04
(c) What is cermet? Give examples. What are the advantages of using cermet
materials over ceramics and/ metals, explain
07

Q.2 (a) Define carbonitride based cermet. 03
(b) Define Titanium carbide based cermet. 04
(c) Why commercial titanium carbonitride based cermets are preferred over
titanium carbide based cermets ?
07
OR
(c) Why too little or too much chromium addition is detrimental for titanium
carbonitride based cermets?
07
Q.3 (a) Why is boron carbide so hard material? 03
(b) Describe methods of synthesis of Boron Carbide in detail. 04
(c) A strong metal-ceramic bond is essential for a satisfactory cermet productio n?-
explain.
07
OR
Q.3 (a) Describe features of cermet. 03
(b) Describe in detail the most commonly used production routes of cermets. 04
(c) Describe in detail the different preparation routes for the synthesis of titanium
carbonitride.
07

Q.4 (a) Define spontaneous polarization. 03
(b) Describe different polymorphs of BaTiO3 with schematic. 04
(c) Describe methods of synthesis of Silicon Carbide in detail. 07
OR
Q.4 (a) Discuss why zirconia has much toughness index. 03
(b) Describe polymorphic forms of zirconia. 04
(c) Describe the mechanism of transformation toughening in Zirconia. 07
Q.5 (a) Define what is an implant material. 03
(b) Describe carbon based implant materials in detail. 04
(c) Define fracture toughness. Explain why does a FCC nickel crystal show a
higher value of Critical Resolved Shear Stress whereas a HCP zinc crystal
shows a lower value.
07
OR
Q.5 (a) Define composite material. 03
(b) Describe applications of ceramic composites. 04
(c) Describe synthesis and applications of Cermet materials. 07
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