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- For a powder binding process that mixes a 1:2 volume ratio mixture of semi-crystalline polyethylene powder with a density of 0.900 g/cm³ and crystalline polyethylene powder, what is the percent crystallinity of the manufactured parts? (The density of polyethylene in its amorphous and crystalline states is 0.870 g/cm3 and 0.998 g/cm3 respectively) (This question has only one correct answer) O a. % Crystallinity = 65.50% O b. % Crystallinity = 57.25% С. % Crystallinity = 82.30% O d. % Crystallinity = 76.99% е. % Crystallinity = 55.45%For a powder binding process that mixes a 1:2 volume ratio mixture of semi-crystalline polyethylene powder with a density of 0.900 g/cm³ and crystalline polyethylene powder, what is the percent crystallinity of the manufactured parts? (The density of polyethylene in its amorphous and crystalline states is 0.870 g/cm³ and 0.998 g/cm³ respectively) (This question has only one correct answer) О а. % Crystallinity = 55.45% O . % Crystallinity = 57.25% О с. % Crystallinity = 76.99% Od. % Crystallinity = 82.30% % Crystallinity = 65.50%Calcium oxide (CaO) is a ceramic that has the same crystal strudture as NaCl. Given: R(Ca2)= 0.106 nm and R(O²)-0.132 Calculate the lonic Packing Factor (IPF) of CaO? Select one: Oa. 0.542 Ob.0.21 Oc.0.41 Od.0.12 Oe 0.47 O to.14 Og0.51 On074. 9:12 PM A D 4) ENG 15-Apr-2021
- Question Seven (a) For refractory ceramic materials, cite two characteristics that improve with and two characteristics that are adversely affected by increasing porosity. (b) Show that the minimum cation-to-anion radius ratio for a coordination number of 4 is 0.225. (Hint: Use the AX crystal structure, assuming the anion spheres touch in plane). (c) The unit cell for Al>Os has hexagonal symmetry with lattice parameters a = 0.4759 nm and c 1.2 nm. If the density of this material is equal to 3.99 g/cm' and is calculated according to the formula n'(E Ac+ EAA) V.NA Calculate the atomic packing factor for Al>O, given that the ionic radius for AI is 0.053 nm and i 0' is 0.140 nm. Take N, = 6.023 x 1023 atoms/mole. (d) Mention any three industrial ceramics and indicate their applications.6. Figure shows the cooling curve for aNiO-MgO ceramic. (f) the local solidification time; 2800 2700 2600 2525 2500 28 2400 10 20 30 40 50 Time (min) Temperature (°C)Clear my choice Question 5 Iron (II) oxide (FeO) is a ceramic that has the same crystal structure as NaCi. Not yet answered Given: Marked out of R(Fe2*)= 0.087 nm and R(O2)=0.132 14.00 Calculate the lonic Packing Factor (IPF) of FeO? F Flag question Select one: O a. 0.14 O b. 0.12 Oc 0.74 O d. 0.21 O e. 0.51 O f.0.47 g 0.59 D.0.41
- Hide blocks Iron (II) oxide (FeO) is a ceramic that has the same crystal structure as NaCl. Given: R(Fe2)=0.087 nm and R(0²)-0.132 Calculate the lonic Packing Factor (IPF) of FeO? Select one: O a. 0.12 Ob.0.41 Oc. 0.21 O d. 0.74 Oe. 0.14 O£.0.47 O g. 0.59 O h.0.51 10:14 PM 15-Apr-2021Compare carbonization and nitrificationFigure shows the The influence of volume fraction porosity on the modulus of elasticity for aluminum oxide. What is the reason for the change of modulus of elasticity with volume fraction ?
- a- Calculate the size of the critical nucleus of tin (Sn) after it has been supercooled by 20 °C. Assume that nucleation is uniform. For the solidification of tin (melting point is 232 °C), the enthalpy change is 0.42 GJ/m³. The interfacial energy between liquid and solid is 0.055 J/m². b- Answer the following questions? (Chose only two) 1- What are the advantages of the Hydrothermal growth method? 2- What are the parameters that the perfection of the final crystal is based on by using the growth from the Gel method? 3- What are the types of techniques for growing crystals from the vapor phase?Nickel oxide (NiO) is a ceramic that has the same crystal structure as NaCl. Given: R(Ni2+)= 0.075 nm and R(02)=0.132 Calculate the lonic Packing Factor (IPF) of NiO? O Na CI Select one: a. 0.47 b, 0.74 c. 0.64 d. 0 12 e. 0.14 f. 0.21 g. 0.41Home works: 1/ Calculate the (APF) for simple cubic (S.C)? 2/ Calculate the (APF) for (Tungsten, Nickel, and zinc). 3/ Determine the change percentage in volume and APF that occurs in Titanium as a result of heating when changes from hexagonal close- packed structure (HCP) to body-centered cubic structure (BCC), when (a=0.292nm) and (C=0.463nm)? 4/ Calculate the cell volume of zinc (HCP) type when (APF=0.75), (a=0.15nm) and (C/a + 1.633)? 5/ Calculate the atomic packing factor (APF) for titanium type (HCP) when (C/a = 1.586)? 6/ Calculate the space volume in gold crystal when a= 1.5A°?