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Μολυβδαίνιο Tungsten Κράμα Ακίνητα


Οι βασικές ιδιότητες του βολφραμίου και κράματα μολυβδαινίου έχουν χημικές και φυσικές ιδιότητες.

Οι φυσικές ιδιότητες του κράματος βολφραμίου-μολυβδενίου (σύνθεση)

W

 Project

Mo

74

Atom ordinal

42

183.85

Atomic weight

95.95

Body-centered cubic

Crystal structure

Body-centered cubic

3410°C

Melting

2622°C

5660°C

Boiling point

4804°C

19.3 g/cm3

Density

10.22g/cm3

190.3 kJ/kg

Heat of fusion

289.7 kJ/kg

0.14kJ/(kg·K)

Specific heat（20-100°C）

0.26kJ/(kg·K)

20°C

5.4×10-6Ω·cm

500°C

1.8×10-5Ω·cm

1000°C

5.1×10-5Ω·cm

2000°C

8.3×10-5Ω·cm

3000°C

1.1×104Ω·cm

Resistivity

20°C

5.6×10-6Ω·cm

500°C

2.4×10-5Ω·cm

1000°C

3.6×10-5Ω·cm

1500°C

5.3×10-5Ω·cm

2500°C

7.8×10-5Ω·cm

4.6×10-3 /K

Temperature coefficient of resistance

4.7×10-3 /K

20°C

167.5 W(m·K)

100°C

159.2 W(m·K)

500°C

121.5 W(m·K)

1000°C

111.0 W(m·K)

2000°C

93.0 W(m·K)

Thermal Conductivity

20°C

146.5 W(m·K)

100°C

138.2 W(m·K)

500°C

121.5 W(m·K)

1000°C

98.8 W(m·K)

1500°C

83.8 W(m·K)

100°C

4.5×10-6 /K

1000°C

4.6×10-6 /K

2000°C

5.4×10-6 /K

3000°C

6.6×10-6 /K

Coefficient of linear expansion

100°C

5.2×10-6 /K

500°C

5.7×10-6 /K

1000°C

5.8×10-6 /K

1500°C

6.5×10-6 /K

2000°C

3.89×10-9 Pa

2500°C

2.68×10-5 Pa

3000°C

1.24×10-2 Pa

Vapor Pressure

1600°C

7.09×10-8 Pa

2000°C

5.58×10-4 Pa

2500°C

1.33 Pa

4.5 eV

Electronic work function

4.4 eV

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Χημικές ιδιότητες του βολφραμίου και κράματα μολυβδαινίου (σύνθεση)

Wolfram

 Media  Molybdenum 

No reaction

 Hydrogen  No reaction 

No reaction

 Water  No reaction 

Rapid oxidation state under hot

Steam  700℃strongly oxidizing 

Slight oxidation at room temperature
400 ~ 500 ° C oxidation was significantly
700 ° C above the rapid oxidation of WO3

Air 

Slight oxidation at room temperature
400℃was significantly oxidized 
600℃or more rapidly oxidized to MoO3 

 

800 ° C began to absorb carbon
1400-1600 ° C to generate brittle WC

 Carbon 

900℃began to absorb carbon
1300 ~ 1400℃to generate brittle MO3C

850 ° C began to become brittle
1000 ° C or more generated WC

 Carbon monoxide 

800℃above the reaction Mo2C

1200 ° C or more oxidized tungsten

 Carbon dioxide 

700℃above the oxidation of molybdenum

2000 ° C or less does not react
2300 ° C or more nitrides

 Nitrogen 

500℃or less does not react
600℃or more brittle
1500℃or more nitrides

Under the hot state is oxidized

 Nitrogen dioxide 

Under the hot state is oxidized

A little hot state reaction

 Sulfur 

440℃above the reaction of sulfides

Under the hot state is oxidized

 Sulfur dioxide 

Under the hot state is oxidized

Fluoride is generated at room temperature
250-300 ° C to generate chloride
Bromide and iodide generated under the hot state

 Halogen 

Fluoride is generated at room temperature
250℃to generate chloride
Does not react with the iodine hot state

Do not react at room temperature

 Ammonia 

The reaction temperature is slightly lower

Almost insoluble in sodium hydroxide solution
Rapidly dissolved in the molten sodium hydroxide

Sodium hydroxide 

Slightly dissolved in sodium hydroxide solution
Rapidly dissolved in the molten sodium hydroxide

Slightly dissolved

 Nitrate 

Easily dissolved

Sulfuric acid at room temperature but the reaction is not dissolved in concentrated sulfuric acid little
Slowly soluble in hot dilute sulfuric acid and concentrated sulfuric acid

Sulfuric acid 

Slightly dissolved in dilute sulfuric acid at room temperature was slowly dissolved in hot dilute sulfuric acid
Slowly dissolved in concentrated sulfuric acid
200 ~ 50℃was dissolved in concentrated sulfuric acid rapidly

Do not react at room temperature
Slightly dissolved at 100 ° C

Hydrochloric acid 

Slightly dissolved in hot dilute hydrochloric acid

Slightly dissolved at room temperature

 Hydrofluoric acid  Slightly dissolved at room temperature 

Was dissolved in hot aqua regia

Aqua regia  Dissolved at room temperature, dissolved in hot aqua regia quickly 

Rapidly dissolved in the molten salt

 Sodium nitrite Rapidly dissolved in the molten salt

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