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Powder metallurgy: Quiz

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Question 1: Exceedingly fine particles also have been prepared by directing a stream of molten metal through a high-temperature plasma jet or ________, simultaneously atomizing and comminuting the material.
OxygenFlameHydrogenFire

Question 2: Powders of the elements Ti, V, Th, Nb, Ta, Ca, and U have been produced by high-temperature reduction of the corresponding nitrides and ________.
CarbideCarbonAluminiumChromium

Question 3: Fe, Ni, U, and Be submicrometre powders are obtained by reducing metallic ________ and formates.
EDTAWarfarinOxalateAspirin

Question 4: Two main techniques used to form and consolidate the powder are ________ and metal injection molding.
SinteringSiliconCarbonCeramic engineering

Question 5: There is evidence that ________ powders were fused into hard objects as early as 1200 B.C.
ZincChromiumIronOxygen

Question 6: The usual performance index used is the ________ R = fvd/n, where f = fluid density, v = velocity of the exit stream, d = diameter of the opening, and n = absolute viscosity.
Fluid dynamicsStrouhal numberReynolds numberKnudsen number

Question 7: The history of powder metallurgy and the art of metals and ________ sintering are intimately related.
CeramicCeramic engineeringCeramic materialsSolid

Question 8: One application of this observation is to coat brittle materials in whisker form with a submicrometre film of much softer metal (e.g., ________-coated tungsten).
CobaltNickelChromiumZinc

Question 9: All considerations of solid-liquid phase changes can be ignored, so powder processes are more flexible than casting, ________, or forging techniques.
ExtrusionSolderingDrawing (manufacturing)Sheet metal

Question 10: Other substances that are especially reactive with atmospheric oxygen, such as ________, are sinterable in special atmospheres or with temporary coatings.
CopperTinLeadAluminium







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