1. - in ceramics has been reduced by means of various techniques, such as gas condensation. 2. ---- - that is by the linking and cross-linking of different monomers. 3. Traditional ceramics, such as ---- and --- 4. The density of ------- is lower than that of linear-chain polymers. 5. The APF is
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- 11) JJ Techie calcined some ceramic powders at 1600℃ for 12 hrs, when removed from thefurnace, JJ was upset to find a big hard lump. Explain to JJ what happened. (10 points)12) Continue to Question 9, After grinding up to the lump, someone told JJ to add a sintering aidand deflocculant to the ceramic before trying to press it into cylinders 10 inch by 0.25 inch indiameter. Do you have any suggestions for JJ? JJ needs this size ceramic rod for experiments. Number 12 please the information in question 11 is applicable.[6] Which of the following may have caused the formation of bands of the components? (base on the picture provided) a.Overloading of the samples b.Use of wrong mobile phase c.Chamber is unsaturated d.Both a and b e.All of the aboveAZ91 alloy; a) What is its chemical composition? b) Which of the strength increasing methods are suitable and which are not? Explain c) Is nitration suitable as one of the surface hardening methods? Please explain
- 1. What are the practical implications of alloying in carbon and alloy steels? 2. Make use of drawings of segments of the Fe-Cr phase diagram to illustrate the reason for the existence offerritic, martensitic and austenitic stainless steels by also noting the influence of specific alloying elementswhere-applicable. .Lattice parameters of α and β phases were calculated from x-ray diffraction measurements performed in A-B alloys with different compositions, all quenched from 500, 600 and 700 °C. Draw a schematic A-B phase diagram using this informationList three main types of crystal structure systems in metals, and illustrate the main differences between Body Centred Cubic, Face Centred Cubic and Hexagonal Close Packed structures, in terms of the atomic plane arrangements, Coordinate Number (CN) and Atomic Packing Factor (APF) calculations, with giving metal examples for each type and explain the effect of this difference on the metal properties
- POLYMER CHEMISTRY - 1. Briefly describe what is thermoplastic, thermoset plastic and elastomer. Give examples to clarify your answers. 2. Briefly discuss the effect of thermodynamic on polymerization. 3. What are important factors influencing the properties of polymers?Comparing two FCC metals, one with melting temperature of 857 ºC and one with melting temperature = 1284 ºC, which would you expect to have a larger fraction of vacant sites (Nv/N) at a temperature one degree below their respective melting points? Write down answer in about 4 sentences, and include all relevant quantities to make your point.Silane and germane are both susceptible to spontaneous combustion. Why is germane moresensitive than silane in this regard?
- 2. What is glass-ceramic? Please explain the differences between glass and glass & ceramics ? (Please consider microstructures and mechanical behavior etc.) a) If you want to obtain transparent diopside glaze, which oxides/raw materials will you choose, why? What parameters will you pay attention to create these crystals? Why? b) When you prepared transparent anorthite glaze, you realized that, this glaze did not show transparent property and it was completely opaque. What are the reasons for this effect? How will you solve this problem? Please explain ?Question 1 a. Briefly describe what is thermoplastic, thermoset plastic and elastomer. Give examples to clarify your answers. b. Briefly discuss the effect of thermodynamic on polymerization. c. What are important factors influencing the properties of polymers? Question 2 a. Discuss the suitable initiator to start an addition polymerization. b. Define what is auto-acceleration, what causes this effect and how to minimize this effect. c. Briefly discuss emulsion and suspension polymerization techniques. Question 3 a. Discuss the differences between condensation and addition polymerization. b. What requirement should be provided to achieve high yield and high molecular weight of polymer by condensation reaction? c. What is interfacial polymerization? Question 4 a. Describe biopolymer and synthetic polymer. Give examples to support your answer b. Briefly discuss the classification of polymers. c. Why polymers are widely used in our daily life? Question 5 a. Describe TWO (2) important…Sketch and label the expected stress-strain curves at room temperature for lightly cross-linked poly(butadiene) and reinforced poly(methyl methacrylate). Compare the behaviour of each specimen in terms of modulus and toughness.