When applying a standard ( unpulsed ) AC or DC current, it is often referred to as " FAST Direct Hot Pressing ( FAST DHP ) ", which is a common term in many industries.
22.
In principle the same improved sinter results ( compared to conventional hot pressing ) can be achieved by all direct hot pressing techniques, if the improvement is only due to the in-situ heating of the powder.
23.
In principle the same improved sinter results ( compared to conventional hot pressing ) can be achieved by all direct hot pressing techniques, if the improvement is only due to the in-situ heating of the powder.
24.
"' Hot pressing "'is a high-pressure, low-strain-rate powder metallurgy process for forming of a powder or powder compact at a temperature high enough to induce sintering and creep processes.
25.
In order to improve densification during hot pressing, diboride powders can undergo milling by attrition to obtain powders of 99 % densification from hot pressing, temperatures of 1800 2000 �C and pressures of 30 MPa or greater are required.
26.
In order to improve densification during hot pressing, diboride powders can undergo milling by attrition to obtain powders of 99 % densification from hot pressing, temperatures of 1800 2000 �C and pressures of 30 MPa or greater are required.
27.
Optical quality transparent spinel has been produced by sinter / HIP, hot pressing, and hot press / HIP operations, and it has been shown that the use of a hot isostatic press can improve its optical and physical properties.
28.
However, the use of pressure sintering by hot pressing is increasing, especially for non-oxides and parts of simple shapes where higher quality ( mainly microstructural homogeneity ) is needed, and larger size or multiple parts per pressing can be an advantage.
29.
Cold compaction after dehydrogenation of the powder, followed by either vacuum hot pressing ( in this case the dehydrogenation process can be bypassed as hydrogen is removed under vacuum ) or HIP and a final vacuum anneal, produces powders with hydrogen below 125 ppm.
30.
Other products were added from time to time, including cotters for locomotives and rolling stock, engineer's keys, taper pins, grooved fastenings for securing all kinds of assemblies, railway permanent way fastenings, rail lubricators and hot pressings of various types.
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