What are the various reasons of increase in hardness in composites made by powder metallurgy?

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How does flow stress influences increase in porosity ?

What are the various reasons for increasing porosity in powder metallurgical composites?. And how flow stress relates to porosity.

03 April 2018 7,843 3 View

Does addition of zinc stearate to metallic powders of iron, copper, aluminium etc in Powder metallurgy brings in problems?

In powder metallurgy stearates are added while mixing of powders in order to facilitate compaction. Further these stearates are removed during dewaxing. If zinc stearate is added as a lubricant...

01 February 2017 1,298 5 View

How to read oxidative wear in SEM image?

While undergoing wear testing of sintered composites at high temperature, how to read oxidative wear in SEM images

10 November 2016 6,607 2 View

Compressive strength of Composites at high temperature?

I wanted to know the approximate reasoning for the decrease in compressive strength of Fe based composite at high temperature (500 degree Celcius).It would be a kind gesture if some one provides...

09 October 2016 6,017 3 View

Complete details of certain refrence?

Kindly apprise me about the complete details of the article titled 'Self-lubricating sintered composites with hexagonal boron nitride and graphite mixtures as solid lubricants'.

06 July 2016 5,206 3 View

Porosity?

What is the easiest way to calculate porosity in sintered alloys.

03 April 2016 8,093 7 View

How to calculate relative density?

In case certain reinforcements of same kind is done in some base matrix in order to know the change in porosity of the reinforced materials with respect to the base matrix, then while...

03 April 2016 6,449 4 View

Location of Oxides formed on Iron based material?

It would be humble gesture if some one could confirm the formation od oxides in the attached SEM image as it is the image of sample tested for wear at 500 degree celcius

02 March 2016 8,573 2 View

How to calculate wear rate?

If some one can clarify as to what formulae is best for calculating wear rate in case of composites.

02 March 2016 6,458 17 View

Can iron oxides such as Fe2O3, Fe3O4 be used as solid lubrication?

Iron oxides possess good hardness and is it possible that these oxides help in reduction of friction at 500 degree celcius

02 March 2016 3,160 8 View

Can formaldehyd-fixed gelatin be melt?

I am puzzled about the properties of gelatin, when used for tissue-embedding. Hard gelatin can be melt again by temperatures about 40°C. Formalin-fixed gelatin is like crosslinked protein and...

07 August 2024 1,686 1 View

How to understand this crystallographic phenomenon of low temperature crystals in zeolite?

During low-temperature testing, new diffraction peaks that appear could be indicative of several phenomena. In one of our tests, we observed notable new peaks around 40° and 45° in a specific...

06 August 2024 726 3 View

Why am I getting "shark finn"-like signal?

My collegue and I are having hard time to understand what is happening. Basically we have a tapping device that work with Arduino and a pneumatic pump. The pump allows the tapping of two...

04 August 2024 4,662 1 View

How to select target material for X-Ray generation?

Generally, the target material is Mo, Co, Cu, Fe, Cr, etc, so on what basis should we choose this material?

31 July 2024 5,824 0 View

In SEM, if a latent variable consists of three observed variables, and each observed variable has four items, what should I do?

Suppose I am studying the construct of "Academic Motivation" (latent variable) in students, which is measured through three observed variables: "Intrinsic Motivation," "Extrinsic Motivation," and...

31 July 2024 3,913 6 View

Why Powder XRD is performed after cruhsing a crystal if Single Crystal XRD analysis of the same crystal has been performed already ?

What information we can get from PXRD analysis other than from SCXRD analysis of a crystal ?

30 July 2024 6,261 4 View

What is the solubility of Iron (+3) in Bismuth Oxide?

Dear all: I am modifying Bismuth Tungstate with Hematite (Fe2O3), so I would like to know about how much Iron(+3) can form a solid solution in a Bismuth Oxide matrix. Best wishes Marco

29 July 2024 2,163 1 View

Mechanochemistry: ball to powder mass or ball to powder volume?

I run mechanochemical reactions that involves the use of a large amount of catalyst (1:1 molar ratio to the reactant). When I try to understand the effect of amount of catalyst on the reaction, I...

23 July 2024 9,938 1 View

Is it true that there is a physico-statistical meaning to the constant π other than circular geometry but the iron guardians of the SE deny it?

We assume that there is a physico-statistical meaning to the constant π other than circular geometry, but the iron guardians of the Schrödinger equation deny this. The iron guardians of the...

22 July 2024 4,285 9 View

Is there a good macro photography kit for on-site metallurgical investigation?

I am looking to purchase a photography kit for onsite metallurgical investigations, such as capturing photos of worn areas, hot tears, cold tears etc. Could anyone suggest me a good...

22 July 2024 3,490 2 View

Ileana Nicoleta Popescu

I hope in this article to find all answers you need. Sincerely yours,

Popescu I.N.

sanjay mohan Sharma

Thanks LLeana

Liang Tian

Here is an interfacial strengthening example: Article A deformation-processed Al-matrix/Ca-nanofilamentary composi...

Also small oxides can contribute to strengthening by Oxide dispersion strengthening