Polymeric Tribotechnical Composites on the Basis of Polytetrafluoroethylene and Complex Fillers

2020 ◽  
Vol 992 ◽  
pp. 733-738
Author(s):  
T.A. Isakova ◽  
P.N. Petrova
Keyword(s):  
Wear Resistance ◽  
Low Temperatures ◽  
High Performance ◽  
Polymeric Materials ◽  
Strength Properties ◽  
Planetary Mill ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Initial Polymer ◽  
Properties Of Composites

Perspective polymeric materials for use in frictional units as bearings and sliding supports, the mobile sealants of piston rings, cuffs are composites on the basis of polytetrafluoroethylene (PTFE). They significantly improve the performance of equipment at low temperatures, reduce repair expenses and losses from idle times. When modifying polymers, physical methods of exposure are increasingly used, ensuring the activation of materials and high performance characteristics. Objective: the effect of complex fillers, obtained by their joint activation in a planetary mill, on the deformation and strength and tribological characteristics of composites based on PTFE. This work shows the promise of using the joint mechanical activation of components of different nature to obtain complex fillers. The use of the modified ultradispersed polytetrafluoroethylene (UPTFE) of zeolite as a filler of PTFE leads to complex improvement of properties of composites: the tensile strength and elongation at rupture increase by 20% in comparison with initial polymer. The wear resistance increases by 3-6 times in comparison with the composites containing only the activated zeolite and by 900 times in comparison with initial polymer. The addition of the modified UPTFE of a magnesium aluminate spinel (MAS) leads to increase in deformation and strength properties by 10-30% and an increase in wear resistance by 140 times in comparison with initial polymer.

Influence of Additive’s Concentration on the Temperature Conditions for the Formation of the Solid Solutions of the System MgAl2O4-Ga2O3

2021 ◽  
Vol 1037 ◽  
pp. 135-140
Author(s):  
Alena Vladimirovna Ulianova ◽  
Marina O. Senina
Keyword(s):  
Solid Solutions ◽  
High Performance ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Temperature Synthesis ◽  
Performance Properties ◽  
Temperature Conditions ◽  
Ceramic Samples ◽  
Firing Mode ◽  
Selection Of

The production of a precursor of magnesium aluminate spinel (AMS) by thermic synthesis to obtain a material with high-performance properties is reviewed in the work. The temperature synthesis of AMS is determined, the introduction of the additive is described in the range of concentrations of 3, 5, and 7 mol.%. The current processes during the firing of products have been investigated with a view to the further selection of the firing mode of the ceramic samples, which can be obtained.

scholarly journals Investigation of the thermal, mechanical and biological properties of PVC/ABS blends loaded with cobalt chloride for biomedical and electronics applications

2021 ◽  
Vol 86 (6) ◽  
pp. 591-602
Author(s):  
Muhammad Shakir ◽  
Muhammad Khosa ◽  
Khalid Zia ◽  
Muhammad Saif ◽  
Tanveer Bokhari
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Cobalt Chloride ◽  
Polymeric Materials ◽  
Biological Properties ◽  
Thermal Mode ◽  
Solution Casting ◽  
Ft Ir ◽  
Sem Analyses ◽  
Properties Of Composites

New PVC/ABS and CoCl2 composites with various concentrations of cobalt chloride (?10 wt. %) were synthesized by solution casting techniques and investigated by spectro-chemical, morphological and thermal mode of characterization. The FT-IR, XRD and SEM analyses proved the smooth distribution and uniformity of the constituents of the composite materials. Thermal behavior showed that the addition of CoCl2 to the PVC/ABS blends enhanced the thermal stability and improved mechanical properties of composites due to crosslinking between PVC/ABS blend and CoCl2. Thus based on their remarkable morphology, thermomechanical stability and promising bioactivities, the synthesized composites could be applied for high performance polymeric materials in the field of biomedics and electronics.

Co-cooking nonwoods with hardwoods

TAPPI Journal ◽  
2014 ◽  
Vol 13 (6) ◽  
pp. 19-24
Author(s):  
TROY RUNGE ◽  
CHUNHUI ZHANG
Keyword(s):  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Strength Properties ◽  
Agricultural Residues ◽  
Kraft Pulping ◽  
Pulp And Paper ◽  
Strength Increase ◽  
Xylan Content

Agricultural residues and energy crops are promising resources that can be utilized in the pulp and paper industry. This study examines the potential of co-cooking nonwood materials with hardwoods as means to incorporate nonwood material into a paper furnish. Specifically, miscanthus, switchgrass, and corn stover were substituted for poplar hardwood chips in the amounts of 10 wt %, 20 wt %, and 30 wt %, and the blends were subjected to kraft pulping experiments. The pulps were then bleached with an OD(EP)D sequence and then refined and formed into handsheets to characterize their physical properties. Surprisingly, all three co-cooked pulps showed improved strength properties (up to 35%). Sugar measurement of the pulps by high-performance liquid chromatography suggested that the strength increase correlated with enriched xylan content.

A Recommender System for Inverse Design of Polycarbonates and Polyesters

2020 ◽  
Author(s):  
Nathaniel Park ◽  
Dmitry Yu. Zubarev ◽  
James L. Hedrick ◽  
Vivien Kiyek ◽  
Christiaan Corbet ◽  
...  
Keyword(s):  
Ring Opening ◽  
High Performance ◽  
Recommendation System ◽  
Polymeric Materials ◽  
Monomer Conversion ◽  
Design Strategy ◽  
Ring Opening Polymerization ◽  
Inverse Design ◽  
False Negatives ◽  
Accelerate Development

The convergence of artificial intelligence and machine learning with material science holds significant promise to rapidly accelerate development timelines of new high-performance polymeric materials. Within this context, we report an inverse design strategy for polycarbonate and polyester discovery based on a recommendation system that proposes polymerization experiments that are likely to produce materials with targeted properties. Following recommendations of the system driven by the historical ring-opening polymerization results, we carried out experiments targeting specific ranges of monomer conversion and dispersity of the polymers obtained from cyclic lactones and carbonates. The results of the experiments were in close agreement with the recommendation targets with few false negatives or positives obtained for each class.<br>

OLIN C197

Alloy Digest ◽  
1999 ◽  
Vol 48 (1) ◽  
Keyword(s):  
Thermal Conductivity ◽  
Wear Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Performance ◽  
Corrosion And Wear ◽  
Contact Forces ◽  
High Current ◽  
Lower Strength ◽  
Current Carrying Capability

Abstract Olin C197 is a second-generation high performance alloy developed by Olin Brass. It has a strength and bend formability similar to C194 (see Alloy Digest Cu-360, September 1978), but with 25% higher electrical and thermal conductivity. High conductivity allows C197 to replace brasses and bronzes in applications where high current-carrying capability is required. Also, the strength of C197 provides higher contact forces when substituted for many lower strength coppers. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion and wear resistance as well as forming and joining. Filing Code: CU-627. Producer or source: Olin Brass.

TLS A6

Alloy Digest ◽  
2006 ◽  
Vol 55 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Physical Properties ◽  
Tool Steel ◽  
Low Temperatures ◽  
Heat Treating ◽  
Tool Steels

Abstract TLS A6 is a medium-alloy air-hardening tool steel that is known for its through hardening at the low temperatures typically used with oil-hardening tool steels. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on wear resistance as well as heat treating and machining. Filing Code: TS-638. Producer or source: Timken Latrobe Steel.

THYRODUR 2510

Alloy Digest ◽  
1993 ◽  
Vol 42 (11) ◽  
Keyword(s):  
Wear Resistance ◽  
Physical Properties ◽  
Surface Treatment ◽  
Low Temperatures ◽  
Heat Treating ◽  
Die Steel ◽  
Aisi D2

Abstract THYRODUR 2510 (AISI D2) is an oil hardening, non-shrinking die steel which can be hardened at relatively low temperatures. The alloy exhibits excellent wear resistance. This datasheet provides information on composition, physical properties, and hardness. It also includes information on heat treating and surface treatment. Filing Code: TS-521. Producer or source: Thyssen Specialty Steels Inc.

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