Optimization of the manufacture of a sintered iron-phosphorus base frictional material

Shvedkov, E. L.; Derkacheva, G. M.; Panaioti, I. I.

doi:10.1007/bf00807731

Cited by 2 publications

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“…Chemistry in the present investigation relies on use of ferro-phosphorus which forms phosphide eutectic network along the grain boundaries of alloyed ferrite [7]. It is expected that this will provide improved frictional characteristics in the brake pad.…”

Section: Introductionmentioning

confidence: 99%

Development of Iron Based Brake Friction Material by Hot Powder Preform Forging Technique used for Medium to Heavy Duty Applications

Asif¹,

Chandra²,

Misra³

2011

JMMCE

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A promising friction material, Iron -based friction material, was prepared by powder metallurgy (PM) processing utilizing hot powder preform forging (near net-shape).The preparation of the product and its characterization are presented in this paper. These products are useful in heavy duty Military Aircraft applications such as AN-32. In order to eliminate costly environmental control systems to protect products during their high temperature processing (as is conventionally practiced employing hydrogen gas), the present investigation relies on carbon (mixed in the brake pad formulation) as reducing agent and high temperature oxidation resistant glassy coating (separately developed) applied over the product's surface after cold compacting. After conducting an initial characterization such as hardness, density and Pin-on Disc tests, the samples were tested in sub-scale dynamometer under Rejected Take Off conditions. It was observed that the obtained density in the present investigation is higher than the reported density obtained by sintering route, and wear is on the lower side of the range as per the Aeronautical Standards. Optical metallography was used to investigate the microstructure of friction, interface and backing layer. It was observed that the distribution of ingredients in matrix was homogeneous. The results also indicate that the coefficient of friction is more stable, and wear is lower with respect to temperature rise. .

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Section: Introductionmentioning

confidence: 99%

Development of Iron Based Brake Friction Material by Hot Powder Preform Forging Technique used for Medium to Heavy Duty Applications

Asif¹,

Chandra²,

Misra³

2011

JMMCE

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“…(i) metal base: iron for strength and thermal stability 4,5 (ii) abrasives: ceramic oxides/carbides, phosphides, etc for wear resistance [4][5][6] (iii) thermal conductors: copper as it remains predominantly unalloyed with the iron matrix 7,8 (iv) anti-seizure: graphite dispersed in the metal matrix to resist the possibility of welding with the rotor and for smooth engagement 4-6 (v) friction modifiers: sulphides/sulphates to stabilise the coefficient of friction. 9,10 Concerns have been shown 7,8 for higher additions of copper owing to the growth of the friction layer during sintering.…”

Section: Introductionmentioning

confidence: 99%

New processing technology for manufacture of heavy duty metalloceramic brake pads

2011

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Heavy duty metalloceramic brake pads are currently manufactured by compacting and sintering the metal powder mixture containing about 20-30% non-metallic constituents. This technology suffers from certain limitations such as poor density, weak joining of backing plates with friction material layers, large consumption of hydrogen gas during processing, etc. etc. In order to overcome these limitations, new technology based on 'hot powder forging' has been developed in the present investigation. This technique offers efficient diffusion bonding between friction elements and the steel container which happens to become the backing plate of the brake pad assembly. The brake pads developed through this technology have been tested for military aircrafts namely AN-32 and MIG-27. It has been observed that the pads made through this technology are superior in performance in comparison with the pads made by sintering technology. Furthermore, the chemistry employed in the present technology is much simpler. This paper deals with detailed characterisation of brake pads suitable for AN-32 and MIG-27 aircrafts.

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Optimization of the manufacture of a sintered iron-phosphorus base frictional material

Cited by 2 publications

References 0 publications

Development of Iron Based Brake Friction Material by Hot Powder Preform Forging Technique used for Medium to Heavy Duty Applications

Development of Iron Based Brake Friction Material by Hot Powder Preform Forging Technique used for Medium to Heavy Duty Applications

New processing technology for manufacture of heavy duty metalloceramic brake pads

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