ULTRA BRONZE®
(A superior and economical antifriction alloy)

ULTRA BRONZE® is a Zn-Al-Cu-Sn etc. alloy with unparalleled bearing properties and silver in colour. The unusal anti-friction properties of ULTRA BRONZE® brings about a very fine running surface and low temperature, whereby pivots and shafts are protected. Frictional load dissipation of energy is reduced in the use of bushings made of ULTRA BRONZE®therefore this alloy is suitable and qualified for bushings for low and high speeds with light and/or heavy loads. ULTRA BRONZE® can stand extreme conditions of shaft deflections and emergency starting and stopping conditions.
It is an ideal bearing material for heavy and light load pressures with low and high surface speeds.
The main factor in making ULTRA BRONZE® economical is the fact that it has a specific gravity of 4.8 only as compared to 8.7 of other bronzes, which entails a considerable savings.
ULTRA BRONZE® has all the qualities of bearing alloy i.e.

COMPATIBILITY,
LOAD CAPACITY,
HARDNESS,

CONFORMABILITY,
FATIGUE STRENGTH,
STRENGTH

EMBEDDABILITYCORROSION RESISTANCE

Hence ULTRA BRONZE® is a technically superior and economically cheaper anifriction alloys as compared to Gun metal, Phos. Bronze, Leaded Bronze, Aluminium Bronze, Other Traditional Bronzes, Brasses, White Metal and Nylon.

ULTRA BRONZE® is technically superior to the traditional bronze because of the following properties of ULTRA BRONZE® .

Application & Property
  1. Higher Tensile Strength.
  2. Double thermal conductivity.
  3. Lower specific weight.
  4. Easy machinability.
  5. Four to Five times longer life than Phos. Bronze.

ULTRA BRONZE® is cheaper even at initial purchase as its specific gravity is only 4.8. Thus if a particular bush in Phos. Bronze or Gun Metal weighs 10 Kgs then the identical bush in ULTRA BRONZE® will weigh only 5.6 Kgs. Over and above the above stated fact ULTRA BRONZE® is economical as its working life is 4 to 5 times longer than Phos. bronze.

Microstucture: ULTRA BRONZE® has a hetrogenous structure i.e. hard particles in soft matrix In this case the hard ternary eutectic Cu-Al-Zn etc is in a soft binary matrix of Zn/Al. The microstructure is similar in form to the tin bronzes.

In case of ULTRA BRONZE® the question of diffussion of copper into journal does not arise as :-

  1. It has a low content of copper.
  2. Copper is not present in free state as it forms intermetallic compound with Zn and Al.
  3. Easily oxidised surface of ULTRA BRONZE® prevents diffusion.

It is claimed that in the event of lubrication failures, bushings of ULTRA BRONZE® will not score the shaft, no welding of bearing to the shaft will occur and the shaft will not suffer any embrittlement due to copper penetration.

There is no change in the texture even when ULTRA BRONZE® is remelted several times, borings, turnings, scrap pieces can be remelted and recast without under going any deterioration in quality.

ULTRA BRONZE® is less sensitive to load fluctuations thus suggesting its suitability as a bearing material for heavy static loads and those subjected to sudden and high impact loadings as are found in the case of cranes, road rollers, tractors, earth moving machinery, etc.