scholarly journals Silicon nitride materials for hot working of high strength metal wires

2010 ◽  
Vol 17 (3) ◽  
pp. 596-606 ◽  
Author(s):  
Robert Danzer ◽  
Markus Lengauer
Keyword(s):  
Silicon Nitride ◽  
High Strength ◽  
Hot Working ◽  
Metal Wires

YSS DAC 10

Alloy Digest ◽  
2017 ◽  
Vol 66 (12) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
High Strength Steel ◽  
Die Casting ◽  
High Strength ◽  
Heat Treating ◽  
Hot Working ◽  
Temperature Performance

Abstract YSS DAC 10 is a high-strength steel for precision die casting and hot-working press dies. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on high temperature performance as well as heat treating. Filing Code: TS-745. Producer or source: Hitachi Metals America Ltd.

Development and Fabrication of Silicon Nitride Components for Ceramic Gas Turbine

1997 ◽  
Author(s):  
Keisuke Makino ◽  
Ken-Ichi Mizuno ◽  
Toru Shimamori
Keyword(s):  
High Temperature ◽  
Silicon Nitride ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Turbine Blades ◽  
High Strength ◽  
Inlet Temperature ◽  
Turbine Inlet Temperature ◽  
Spark Plug ◽  
Power Turbine

NGK Spark Plug Co., Ltd. has been developing various silicon nitride materials, and the technology for fabricating components for ceramic gas turbines (CGT) using theses materials. We are supplying silicon nitride material components for the project to develop 300 kW class CGT for co-generation in Japan. EC-152 was developed for components that require high strength at high temperature, such as turbine blades and turbine nozzles. In order to adapt the increasing of the turbine inlet temperature (TIT) up to 1,350 °C in accordance with the project goals, we developed two silicon nitride materials with further unproved properties: ST-1 and ST-2. ST-1 has a higher strength than EC-152 and is suitable for first stage turbine blades and power turbine blades. ST-2 has higher oxidation resistance than EC-152 and is suitable for power turbine nozzles. In this paper, we report on the properties of these materials, and present the results of evaluations of these materials when they are actually used for CGT components such as first stage turbine blades and power turbine nozzles.

High Strength Silicon Nitride Prepared with Eutectic Flux Additions

1977 ◽  
pp. 391-392 ◽  
Author(s):  
J. D. Venables ◽  
D. K. McNamara ◽  
R. G. Lye
Keyword(s):  
Silicon Nitride ◽  
High Strength

Hot Rolling Steels and Super Alloys with Silicon Nitride Tools

2010 ◽  
Vol 65 ◽  
pp. 92-99
Author(s):  
R. Danzer
Keyword(s):  
Silicon Nitride ◽  
Fatigue Cracks ◽  
High Strength ◽  
Ceramic Tool ◽  
Silicon Nitride Ceramic ◽  
Small Surface ◽  
Metal Parts ◽  
Improved Performance ◽  
Montanuniversität Leoben ◽  
Super Alloy

Tools for rolling steels and super alloys, which are nowadays in general made from steel or cemented carbides, suffer from wear and/or from surface cracking caused by thermal fatigue. New tools made from silicon nitride show improved performance in respect to thermal shock loading and wear. But their low toughness manifests also a high risk of brittle failure. Nevertheless the successful use of silicon nitride rolls with having more than a manifold lifetime (compared to the conventional solutions) has been reported in the last years [1 -3]. In this paper earlier work of the Institut für Struktur- und Funktionskeramik at Montanuniversität Leoben on highly loaded silicon nitride rolls is summarized, where the limits of the Application of silicon nitride rolling tools are discussed. On the extreme example of rolls for super alloy wire rolling the behaviour of small surface cracks in the roll track is discussed. It is shown that – for the investigated conditions - rolling high strength steel wires is manageable but rolling of super alloy wires will cause the growth of fatigue cracks, which may destroy the rolls after some tons of rolled wire. A not trivial problem to be solved is the connection of the ceramic tool with the metal parts of the roll stand. Thermal strains of the metal parts can be several times larger than those of the silicon nitride ceramic and can therefore cause very high thermal misfit strains, even if the heating of metal parts seems to be modest. This case is discussed on the example of a catastrophically failed ceramic tool. This clearly shows that not only the tool but also the joint of the tool to the rest of the machinery has to be designed carefully. In summary this work demonstrates that a successful use of silicon nitride ceramic tools for cold and hot forming of metals and alloys is possible.

High-strength silicon nitride ceramics obtained by grain-boundary crystallization

1991 ◽  
Vol 26 (20) ◽  
pp. 5513-5516 ◽  
Author(s):  
K. Komeya ◽  
M. Komatsu ◽  
T. Kameda ◽  
Y. Goto ◽  
A. Tsuge
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
High Strength ◽  
Nitride Ceramics

Dislocation loops in α-silicon nitride single crystals

1992 ◽  
Vol 50 (1) ◽  
pp. 342-343
Author(s):  
H. Suematsu ◽  
J. J. Petrovic ◽  
T. E. Mitchell
Keyword(s):  
High Temperature ◽  
Silicon Nitride ◽  
Single Crystals ◽  
Mass Production ◽  
High Strength ◽  
Deformation Characteristics ◽  
Dislocation Loops ◽  
Production Lines ◽  
Compressor Rotor ◽  
Structural Applications

Silicon nitride(Si3N4) is well known to be a most promising ceramic material for high temperature structural applications. It has high strength even at 1200°C and its fracture toughness is about 5 to 7 MPa•m½. Si3N4 has been manufactured on mass production lines as the compressor rotor for turbo chargers. For high temperature use, it is important to know the deformation characteristics of the material and the role played by dislocations and other defects. However, research on the nature of defects in Si3N4 has been limited considering the importance of Si3N4. In this study, we have examined defects in single crystals of Si3N4.

MUELLER ALLOY 6750

Alloy Digest ◽  
1979 ◽  
Vol 28 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Hot Working ◽  
General Corrosion ◽  
Torsional Properties ◽  
Automotive Clutch

Abstract MUELLER Alloy 6750 (formerly MBCo 241A) is a moderately high-strength wrought manganese bronze possessing good torsional properties and general corrosion resistance. The material possesses excellent hot-working properties and is readily joined by either soldering, brazing or oxyacetylene welding. Its many uses include automotive clutch disks, shafting and valve stems and bodies. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-384. Producer or source: Mueller Brass Company.

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