Powder Plasma Arc Surfacing Powder -- Self Fluxing Alloy Powder

       

The commonly used alloy powders for powder
plasma arc surfacing mainly include self fusible alloy powder and composite
powder. Today's article introduces self fluxing alloy powder.

 

Self fluxing alloy powder includes nickel
base, cobalt base, iron base, copper base, etc. Among them, iron-based alloy
powder has been widely used because of its wide source of raw materials, low
price and good properties. Nickel based and cobalt based alloy powders have
good comprehensive properties, but nickel and cobalt are rare metals with high
cost. They are generally only used for surfacing with special surface
performance requirements.

(1) Nickel base self fluxing alloy powder:
self fluxing alloys based on nickel are collectively referred to as nickel base
alloys. It can be divided into two categories: nickel borosilicate series and
nickel chromium borosilicate series. Nickel boron silicon series is a self
melting alloy formed by adding an appropriate amount of boron and silicon
elements to nickel; Nickel chromium boron silicon series is to add chromium and
carbon to nickel boron silicon series alloys to form nickel chromium boron
silicon series self melting alloys with wide applications and more varieties.

(2) Cobalt based self melting alloy powder:
this series of self melting alloys are based on metal cobalt and developed on
the basis of stellite alloy. It is formed by adding B and Si elements to cobalt
chromium tungsten alloy. Cobalt based self fluxing alloy has excellent high
temperature performance, good thermal strength, corrosion resistance and
thermal fatigue resistance. It is more suitable for oxidation-resistant,
corrosion-resistant and wear-resistant surface coatings working at 600 ℃ ~ 700
℃. Such as surfacing of sealing surface of high-pressure valve.

(3) Iron based self fluxing alloy powder:
iron based self fluxing alloy powder is mainly composed of iron and several
main elements such as iron, chromium, boron and silicon. This kind of alloy is
developed on the basis of chromium stainless steel and nickel chromium
stainless steel. It can be divided into two types: austenitic stainless steel
type self melting alloy (adding boron and silicon elements to austenitic
stainless steel and adjusting the content of carbon and alloy elements) and
high chromium cast iron type self melting alloy.

(4) Copper based self fluxing alloy powder:
copper based alloy has low friction coefficient and good corrosion resistance
to seawater and atmosphere. Copper base alloy has good scratch resistance, good
plasticity and easy processing. At present, there are two kinds of copper based
self melting alloy powders developed and produced in China, one is tin
phosphorus bronze powder, the other is white copper powder with nickel.

 

 

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