Improving the thermal shock resistance of ceramics based on silicon nitride

1991 ◽  
Vol 48 (12) ◽  
pp. 562-566
Author(s):  
N. M. Bobkova ◽  
A. A. Stepanchuk ◽  
A. V. Deshkovets
Keyword(s):  
Silicon Nitride ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Shock Resistance

Thermal shock resistance of silicon nitride

1977 ◽  
Vol 12 (11) ◽  
pp. 2351-2353 ◽  
Author(s):  
K. Anzai ◽  
H. Hashimoto
Keyword(s):  
Silicon Nitride ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Shock Resistance

Thermal shock resistance of silicon nitride ceramics

1988 ◽  
Vol 20 (11) ◽  
pp. 1477-1480 ◽  
Author(s):  
K. A. Kazakyavichyus ◽  
D. V. Narbutene ◽  
E. N. Chasovskoi ◽  
A. F. Batura ◽  
V. G. Verevka
Keyword(s):  
Silicon Nitride ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Nitride Ceramics ◽  
Shock Resistance

Effect of Starting Powders on Microstructure and Properties of Silicon Nitride Nanoceramics

2012 ◽  
Vol 217-219 ◽  
pp. 239-244
Author(s):  
Hai Jiang ◽  
Chun Yan Tian
Keyword(s):  
Mechanical Properties ◽  
Silicon Nitride ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Grain Morphology ◽  
Hot Press ◽  
Shock Resistance ◽  
Hot Press Sintering ◽  
Spherical Grains ◽  
Hardness Values

Silicon nitride nanoceramics were fabricated by hot press sintering two kinds of Si3N4nano-sized powders. The effect of starting powders on microstructure, mechanical properties and thermal shock resistance were investigated. The microstructure of sintered materials consists of spherical grains and the addition of α–Si3N4to starting powders does not affect the grain morphology. The flexural strength, fracture toughness and thermal shock resistance increase with the increase in amount of α–Si3N4starting powders, and the maximum mechanical properties are obtained when the amount of α–Si3N4 powders is 40wt.%. The hardness values decrease with the increase of α–Si3N4amount.

scholarly journals Hot Pressed Silcon Nitride for Gas Turbine Applications

1972 ◽  
Author(s):  
M. L. Torti ◽  
G. Q. Weaver ◽  
D. W. Richerson
Keyword(s):  
Elevated Temperature ◽  
Silicon Nitride ◽  
Thermal Shock ◽  
Gas Turbine ◽  
Thermal Shock Resistance ◽  
Room Temperature ◽  
Promising Candidate ◽  
Shock Resistance ◽  
Room Temperature Strength

The high strengths now attainable with hot pressed silicon nitride combined with its good oxidation and thermal shock resistance make it a most promising candidate for advanced gas turbine hot components. This form of silicon nitride has flexural strengths of 110,000 psi at room temperature and 60,000 psi at 1200 C. A recent experimental version of the system has exhibited room temperature strength of 145,000 psi and elevated temperature (1200 C) strength of 100,000 psi. This may be the highest strength reported on any material at this elevated temperature.

Current Research Issues in Silicon Nitride Structural Ceramics

MRS Bulletin ◽  
1987 ◽  
Vol 12 (7) ◽  
pp. 73-79 ◽  
Author(s):  
Arvid E. Pasto
Keyword(s):  
Thermal Expansion ◽  
Silicon Nitride ◽  
Thermal Shock ◽  
Thermal Expansion Coefficient ◽  
High Temperatures ◽  
Expansion Coefficient ◽  
Thermal Shock Resistance ◽  
Elevated Temperatures ◽  
Heat Engine ◽  
Shock Resistance

Ceramics have long been known for their refractoriness, or ability to bear loads at elevated temperatures. However, until the 1960s, the predominant refractory ceramics were oxide-based materials such as silica, zirconia, alumina, mullite, magnesia, and their combinations, including silicates. These ceramics were, and still are, used for firebrick furnace linings, crucibles and liquid metal carrier liners, regenerators, and recuperators.However, these materials all possess some characteristic which precludes their use for very high stress, high temperature applications. Typically, the silicates form viscous liquids which allow creep, while zirconia and alumina suffer from poor thermal shock resistance, and magnesia possesses a large thermal expansion coefficient. Consequently, for heat engine applications which involve high temperatures, high stresses, sudden temperature changes (e.g., startup), and may involve the maintenance of tight operating tolerances, a new family of materials is required. The requisite properties for heat engine applications may be found in certain non-oxide materials, namely silicon nitride and silicon carbide. They possess high strength even at high temperatures, low thermal expansion coefficient, and excellent thermal shock resistance. These materials are not thermodynamically stable in air at elevated temperatures and will eventually react to form oxides. Nonetheless, they possess excellent oxidation resistance by virtue of protective silica-based glass oxidation layers.

Thermal Shock Resistance of Si3N4/hBN Ceramic Composites

2018 ◽  
Vol 784 ◽  
pp. 73-78
Author(s):  
Alexandra Kovalčíková ◽  
Michal Húlan ◽  
Richard Sedlák ◽  
Martin Fides ◽  
Csaba Balázsi ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Silicon Nitride ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Hexagonal Boron Nitride ◽  
Hot Isostatic Pressing ◽  
Ceramic Composites ◽  
Test Method ◽  
Shock Resistance ◽  
Quench Test

Si3N4/hBN composites were fabricated by hot isostatic pressing at 1700°C/3h with 1, 3 and 5 wt. % micro-sized or nano-sized hexagonal boron nitride particles added to silicon nitride matrix. An indentation quench test method was used for estimation of thermal shock resistance of monolithic Si3N4and Si3N4/hBN composites. Thermal shock resistance of the composites increased with the increase of size and volume of hBN particles. The critical temperature difference for the composites with micro-sized hBN was significantly higher (over 900°C) compared to the monolithic silicon nitride (580°C).

Reaction Bonded Silicon Carbide and Silicon Nitride for Gas Turbine Applications

1972 ◽  
Author(s):  
R. A. Alliegro ◽  
S. H. Coes
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Silicon Nitride ◽  
Thermal Shock ◽  
Gas Turbine ◽  
Thermal Shock Resistance ◽  
Casting Process ◽  
Ceramic Materials ◽  
Machining Process ◽  
Shock Resistance

Two unique ceramic materials offer the gas turbine designer the opportunity to substitute uncooled high temperature components for the presently cooled metal and alloy ones. Recrystallized silicon carbide made by a casting process and reaction bonded silicon nitride shaped by a simple machining process before firing, offer not only high temperature materials capable of living in the gas turbine environment, but also an intricacy of shape consistent with combustor, shroud and associated high temperature component needs. Silicon carbide’s 3200 F capability and its thermal shock resistance makes it a sound choice; silicon nitride’s low expansion coefficient, thermal shock resistance, and 2900 F capability make it a material of real merit. The properties of these materials are discussed in detail along with potential areas of application and design capabilities.

Sign in / Sign up

Export Citation Format

Share Document