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presintering

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Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006103
EISBN: 978-1-62708-175-7
..., green machining, presintering, microcleanliness improvement, free-machining additives, microstructure modification, and improvements in tool materials. The effects of free-machining agents on machinability and the sintered properties of PM steels are also reviewed. free-machining additives green...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006112
EISBN: 978-1-62708-175-7
... Abstract Powder forging is a process in which unsintered, presintered, and sintered powder metallurgy preforms are hot formed in confined dies. This article provides information on the basic forms of powder forging and describes the material considerations, process considerations...
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Published: 01 December 1998
Fig. 43 Effect of repressing pressure on porosity of 316L stainless steel parts pressed from 4 to 8 tonnes/cm 2 and presintered for 15 min at 1050 °C (1920 °F). Source: Ref 10 More
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Published: 30 September 2015
Fig. 14 Influence of hot repressing temperature on flow stress for PF-4600 at various carbon contents and presintering temperatures. Data are for density of 7.4 g/cm 3 (0.267 lb/in. 3 ). Source: Ref 70 , 71 More
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Published: 01 January 2005
Fig. 15 Influence of hot repressing temperature on flow stress for P/F-4600 at various carbon contents and presintering temperatures. Data are for density of 7.4 g/cm 3 (0.267 lb/in. 3 ). Source: Ref 62 , 63 More
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Published: 01 January 1990
Fig. 1 Powder metallurgy production methods for cermet and cemented-carbide products Production method Products 1. Presintering Cemented-carbide parts and cermets 2. Vacuum sintering Steel-bonded carbides (standard pieces) and cermets 3. Canning Steel-bonded carbides More
Series: ASM Handbook
Volume: 23A
Publisher: ASM International
Published: 12 September 2022
DOI: 10.31399/asm.hb.v23A.a0006853
EISBN: 978-1-62708-392-8
... processes for the manufacture of commercially available zirconia implants. Hard Machining Process White machining is used to machine presintered zirconia to obtain complex profiles such as dental crowns and bridges. It is a dry milling process using tungsten carbide milling tools. This process...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006141
EISBN: 978-1-62708-175-7
..., necks are formed in the structure to provide some rigidity to the shaped components. This is known as the presintering step. The presintering step often overlaps the debinding stage and also the subsequent consolidation stage. After the presintering stage, the part is usually porous but has already...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006097
EISBN: 978-1-62708-175-7
... the minimum sintered density requirement without incurring high sintering costs. A high green density also helps keep the dimensional change during sintering at reasonably low levels. However, the green density should not be so high that it hinders delubrication during presintering. In comparison to iron...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006069
EISBN: 978-1-62708-175-7
... and presintering, where the peak temperature in the furnace is between 500 and 1200 °C (930 and 2190 °F). This imparts some strength for subsequent processing before sintering and removes all organic binders. Oxygen and Carbon Control Carbon content must be controlled within narrow limits during...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006033
EISBN: 978-1-62708-175-7
... or microhardness traces on a polished cross section. Thus, to verify the compaction simulation results, the relationship between hardness and green density is conducted according to the following procedure: Use the same samples as used for obtaining the material parameters. Presinter the compacts...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005502
EISBN: 978-1-62708-197-9
... as used for obtaining the material parameters. Presinter the compacts at a temperature sufficient to bond the particles but below the temperature range where dimensional change or chemical reactions occur. Carefully prepare a metallographic cross section of the presintered samples and treat...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006106
EISBN: 978-1-62708-175-7
... diffused bronze is produced by presintering a premixed bronze at a temperature range from 400 to 750 °C (750 to 1380 °F) in such a way that a metallurgical bond between tin and copper powder is created. The sintered powder is then crushed, ground, and screened. This treatment minimizes segregation...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006118
EISBN: 978-1-62708-175-7
..., it is more practical to employ a presintering step in a separate furnace for delubrication. Green compacts may be presintered in air or nitrogen at 427 to 538 °C (800 to 1000 °F) to volatilize and burn off the lubricant. If higher temperatures are used, a protective atmosphere is required. intering in air...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002193
EISBN: 978-1-62708-188-7
.... Optimizing P/M Part Machining The following are measures that can optimize the machining of P/M materials: Taking advantage of the good machining properties of high-density parts (above 92% of theoretical density) Machining in the presintered condition Using additives that do not require...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006053
EISBN: 978-1-62708-175-7
... pressure using a water-based liquid medium at ambient temperature. Dimensional tolerances for parts produced by CIP are relatively large, so size and shape control are not as critical as in uniaxial pressing. Parts are machined in the green, or presintered, state, and after sintering. Thus, material...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003112
EISBN: 978-1-62708-199-3
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006104
EISBN: 978-1-62708-175-7
..., machining of PM materials can be optimized or improved by: Taking advantage of the good machining properties of high-density parts (above 92% of theoretical density) Machining in the presintered condition Using additives that do not require sacrifices in powder processing or part properties...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003166
EISBN: 978-1-62708-199-3
..., metallic powder is compacted at pressures typically between 150 and 600 MPa (20 and 85 ksi) to form a long billet. Following a light H 2 presinter, the green billet is clamped into water-cooled electrodes for direct sintering in H 2 . Currents exceeding 1350 A/cm 2 of the initial cross section...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006124
EISBN: 978-1-62708-175-7
... ( Ref 25 ). Green parts are presintered at 1200 to 1400 °C (2190 to 2550 °F) for 30 minutes in hydrogen to increase their handling strength. Final sintering at ∼2700 °C (4890 °F) can be performed either directly or indirectly in hydrogen or high vacuum. Typical densities are 80 to 90% of the theoretical...