1. Introduction
Platinum and platinum alloys are widely used in various industrial
branches such as chemical synthesis (as the catalyst) and oil refining
which is due to their high corrosion resistance also at high
temperatures [1,2]. In order to improve the mechanical strength and
workability of Pt alloys, considerable research efforts have been made
to develop finely dispersed intermetallic or non-metallic strengthening
[3,4]. In particular, boron- or zirconium-grain stabilized (ZGS)
platinum materials proved to be markedly superior in this respect to
platinum and its alloys. Earlier studies have shown that it is difficult to
produce such alloys by casting. Cast platinum alloys show the
tendency to segregation which results in inhomogeneous microstructures
being formed [5–7].
The Pt–Rh alloys are used for the production of thin wires intended
for catalytic nets. In order to reduce the material cost and prolong the
service life of the catalytic nets, works have been undertaken to
develop an appropriate technology that permits improving the
mechanical properties of the material through the control of its
microstructure. The method of fabrication of these nets employed
thus far is not satisfactory. During the casting operation, rhodium and
micro-additives are often distributed non-uniformly within the
volume of the Pt–Rh alloy being cast. Certain regions may contain
platinum alone, so that the material becomes inhomogeneous. In
effect, the Pt–Rh wire often breaks during the production of catalytic
nets, or later the nets undergo mechanical damage and corrosion. This
is a serious drawback since the broken wire cannot be repaired in any
way and the damaged fragment of the net can only be re-melted.
1. Introduction
Platinum and platinum alloys are widely used in various industrial
branches such as chemical synthesis (as the catalyst) and oil refining
which is due to their high corrosion resistance also at high
temperatures [1,2]. In order to improve the mechanical strength and
workability of Pt alloys, considerable research efforts have been made
to develop finely dispersed intermetallic or non-metallic strengthening
[3,4]. In particular, boron- or zirconium-grain stabilized (ZGS)
platinum materials proved to be markedly superior in this respect to
platinum and its alloys. Earlier studies have shown that it is difficult to
produce such alloys by casting. Cast platinum alloys show the
tendency to segregation which results in inhomogeneous microstructures
being formed [5–7].
The Pt–Rh alloys are used for the production of thin wires intended
for catalytic nets. In order to reduce the material cost and prolong the
service life of the catalytic nets, works have been undertaken to
develop an appropriate technology that permits improving the
mechanical properties of the material through the control of its
microstructure. The method of fabrication of these nets employed
thus far is not satisfactory. During the casting operation, rhodium and
micro-additives are often distributed non-uniformly within the
volume of the Pt–Rh alloy being cast. Certain regions may contain
platinum alone, so that the material becomes inhomogeneous. In
effect, the Pt–Rh wire often breaks during the production of catalytic
nets, or later the nets undergo mechanical damage and corrosion. This
is a serious drawback since the broken wire cannot be repaired in any
way and the damaged fragment of the net can only be re-melted.
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