Abstract:The drawback of easy oxidation for carbon/ carbon (C/ C) composites has limited their application as
structural materials in aerospace field. The oxidation protective coating is one of the most effective methods that can
realize the long term oxidation protection for C/ C composites at high temperatures. The recent development of oxidation
protective coating materials for C/ C composites, including glass, metal and ceramic coatings were reviewed. The
advantages and defects of traditional preparation technologies as well as their application were analyzed and summarized.
New advances in development of coating technologies were also introduced, and then, the suitable service environment
and recent application of different coating systems were clarified. To meet the ultra high temperature oxidation
protection for C/ C composites above 1 800℃, the problem in recent study and the potential development directions in
the future were proposed.

Abstract:Carbon/ carbon composites are attractive candidates for heat dissipation due to their high thermal conductivity,
low density, low dilatability and excellent mechanical properties. The paper summaries the research and
development of high-thermal conductive C/ C composites domestic and overseas, the thermophysical properties of C/ C
composites and the factors affecting on thermal conductivity are discussed. The thermal conductive mechanism of C/ C
composites,carbon fibers and matrix carbon are introduced, and the preparation and modification of C/ C composites
are also recommended.

Abstract:Nanoporous super thermal insulation material is a new type thermal insulation material with light
weight, high temperature resistance, high porosity and low thermal conductivity. Based on these advantages, it has
become a research hotspot in the field. The most representative nanoporous super thermal insulation materials are aerogel
thermal insulation material and nanopowder based thermal insulating composites. In this paper the research status
of nanoporous thermal insulation material is summarized and the development prospect is shown.

Abstract:Pressure gradient in the insulation materials along the thickness direction, which results from the changes
in pressure around the maneuvering hypersonic vehicles, will lead to gas diffusion and permeation in thermal insulation
materials and affect the insulating property. In order to study the influences of gas diffusion and permeation on materials
insulating properties, a heat transfer model combined conduction radiation with gas diffusion and permeation was
established under Rosseland approximation for radiation heat transfer. The established control equations were solved by
finite volume method and the transient insulting properties under the condition of gas diffusion and permeation were numerically
studied. Results show that gas permeation begins to influence the heat transfer process and worsen transient insulating
property for a 2 cm nanometer insulation material when its permeability is greater than 10-14 m2 under the condition
where the heated surface is at environment pressure of 0.1 MPa and the unheated surface is in vacuum. Gas viscosity
has a significant influence on gas diffusion and permeation process and the diffusion process enhances with the decrease
in viscosity. Extinction coefficient has more significant influence on the thermal response at the insulated surface
than gas diffusion parameters and the temperature response decreases with the increase of extinction coefficient.

Abstract:Based on the microstructure of silica aerogel powder, a multi-scale model revealing the internal feature
of real material is constructed. The nanoporous structure and tensile properties of silica aerogel is simulated using
molecular dynamic (MD) model. The compression molding of silica aerogel powder is modeled using discrete element
method (DEM), and then the multiaxial compressive curve of real material is simulated. The MD simulation indicates
the fractal dimension of silica aerogel decreases as the density increases. Moreover, the DEM simulation reveals the elastic
modulus of silica aerogel powder is larger than that of silica aerogel while the compressive strength of silica aerogel
powder is lower than that of silica aerogel. The compressive strength of silica aerogel powder increases as the confining
stress increases.

Abstract:The paper introduced a new heat-stress coupling experiment for fiber reinforced silica composite radom.
By using gas flow engine and load device, this experiment assessed the strength of radom under ablation. Simulation
was carried out base on the experiment. Comparing with simulation results and experiment results proved that
the simulation method for radom. Eclipse-stress calculating is correct. This method reflected the strength of fiber reinforced
radom, which under ablation, from experiment and theoretical analysis, and provided a new way for fiber reinforced
silica composite radom simulating.

Abstract:The appropriate parameter and reasonable process of technics is the key for autoclave molding of
composite. The technical simulation of virtual autoclave make for the prediction of curing process, and the improvement
of technical efficiency and reduction of manufacture cost. The paper show a software of autoclave simulation:
COMPRO, and the typical model of curing process analysis: thermochemical model, flow-compaction model and
stress deformation model. At last,the key parameter effect on COMPRO analysis have been shown, and a conclusion
about accuracy of COMPRO analysis can be done through the comparison between the data of spar prototype and
COMPRO simulation.

Abstract:This work,using TiO2 micro particles with different geometries as an example,models opacifier optical
parameters’dependence on their shapes and sizes,and computes their average properties according to the actual size
distribution. In consideration of industrial applications,this work discusses the optimization of opacifier parameters to
minimize high temperature radiative transfer for spherical particle with a log-normal size distribution, achieving an
opacified aerogel’s radiative conductivity as low as 1/10 the value of pure aerogels.

Abstract:To investigate the curing process of composite material, the bidirectional couple model including
thermal transfer and curing dynamics for polymer composite material curing process is established. According to the
existing curing criterion, the cylinder composites structure is analyzed in this paper, and the temperature and degree
of cure distribution at internal and outside face sheet is worked out. With the calculation results, because of the
mould’s thermal conductive ability is low, the temperature at the face sheet next to the mould ascends slower than the
face sheet at the other side. However the temperature distribution is more uniform.

Abstract:Two kinds of polyimide(PI) aerogels,PIA-1( BPDA/4-APBI/ OAPS) and PIA-2( BPDA/3-APBI/
OAPS) have been successfully prepared via the supercritical carbon dioxide drying process of the PI gels derived
from 3,3’,4,4’ -biphenylene tetracarboxylic dianhydride(BPDA),2-(4-aminophenyl) -5-aminobenzimidazole(4-
APBI) or 2-(3-aminophenyl) -5-aminobenzimidazole(3-APBI) and octa( aminophenyl) silsesquioxane( OAPS).
The obtained PI aerogels exhibited micromorphology of a strain of beads with the pore size distribution peaks of 22 nm
for PIA-1 and 14 nm for PIA-2. The densities of the PI aerogels are 0. 105 g/ cm3 for PIA-1 and 0. 080 g/ cm3 for
PIA-2; and the Branuaer-Emmet-Teller (BET) surface areas of the aerogels are 693 m2 / g and 302 m2 / g, respectively.
In addition, the PI aerogels exhibited good flexibility and thermal resistance with the Tg higher than 350℃ and
initial thermal decomposition temperatures over 530℃.

Abstract:A silane coupling agent containing isocyanate was designed and employed to modify the interface of
quartz fiber reinforced silicon containing arylacetylene( PSA) composite. The flexural properties, dielectric properties,
heat-resistant properties and mechanical properties of GF/ PSA composite were compared. The results showed
that, the interfacial adhesion performances between the fibers and the resin are improved by the chemical bonding between
the coupling agent and the active groups on fibers surfaces. The interlaminar shear strength of the treated quartz
fiber-PSA composite has been greatly improved by 24. 7% compared with those untreated. The results revealed that
the flexural strength of composite increased 12. 4% after modified. The treating process on quartz fiber by IPTS had
ignored effect on the dielectric properties of composite, and the insulating properties of composite are still excellent.
No glass transition happened under the tested conditions, which meant the addition of IPTS wouldn’ t influence the
heat-resistant of composite.

Abstract:ZrO2 aerogel modified by SiO2 was synthesized by aging ZrO2 gel prepared using ZrOCl2·8H2O as
precursor, and 1,2-propylene oxide(PO) as a gelation agent in tetraethoxysilane (TEOS) solution followed by high
temperature supercritical fluid drying method ( HTSCFD). The influence of SiO2 to the structure of ZrO2 aerogel at
high temperature was investigated by comparing structural transformation before and after SiO2 modifying. The prepared
samples were characterized using FT-IR spectra, X-ray diffraction ( XRD), scanning electron microscopy
(SEM) and transmission electron microscopy (TEM). The results showed that high temperature stability of ZrO2 aerogel
is highly improved after forming a SiO2 layer covered on the surface of the ZrO2 gel particles during aging process
in TEOS solution.

Abstract:A series of ethynyl-containing organosilicon hybrid polymers had been synthesized via Sonogashira
cross-coupling reactions using ethynyl-ended silazane (N,N’—bis(4-ethynylphenyl) -1,1-diphenylsilylenediamine,
M1) monomer with different silyene-containing [—Si(CH3 )2—,—Si(CH3 )2—O—Si(CH3 )2— and —Si(CH3 )2—
O—Si(CH3)2—O—Si(CH3 )2—] bromophenyl-ended monomers. These polymers showed good solubility. The polymers
were characterized by FTIR, 1H NMR and gel permeation chromatogratography(GPC). Their thermal properties
are investigated by thermogravimetric analysis(TGA). The results show that these polymers has good thermal stability.

Abstract:Zirconia aerogels, which process good nano-network structure, were prepared by hydrothermal-gel
method using zirconium oxynitrate as precursor and carbamide as gelation accelerator,followed by supercritical fluid
drying. The structure of the porous zirconia aerogels was investigated by the measurement of pore size distribution,
TEM, BET,and XRD. The results show that the as-prepared zirconia aerogels with a high specific surface area of 445
m2 / g consist of the amorphous and tetragonal phase. The pore size distributions of as-prepared aerogels have two significant
maxima:5 to 7 nm and 30 to 40 nm.

Abstract:A benzoxazine hybrid resin(BZ-H) was prepared by thermal prepolymerization between benzoxazine
(BZ) and polysilazane to enhance thermal stability of benzoxazine resin, and glass fiber cloth/ hybrid resin composite
was also obtained by molding process. The resin shows a low viscosity between 70℃ to 170℃, indicating that the resin
possesses suitable viscosity to fabricate composites. DSC results show the hybrid resin can be cured at lower temperature.
Dynamic mechanical analysis(DMA) shows the inflection point of tanδ is 354. 7℃. In nitrogen,5% weight loss
temperature of the final cured products is 460℃, and char yield is 75. 68% at 900℃. In air, 5% weight loss temperature
of the final cured products is 466℃,and char yield is 16. 39% at 900℃. Results of mechanical property showed
that flexural strength,flexural modulus and interlaminar shear strength of the composite is 433 MPa,22 GPa and 24
MPa,respectively. At 350℃, the retention rate of flexural strength, flexural modulus and interlaminar shear strength
for the composite is 40%,68% and 54%. SEM image showed strong cohesiveness between benzoxazine and glass fiber,
which endowed the composites excellent mechanical properties.

Abstract:A novel liquid precursor for ZrC was prepared by blending of polyzirconoxanesal (PNZ) and propargyl
modified novolac resin(PN). The precursor could be converted into ZrC upon heat treatment at 1 600℃. The crosslinking
behavior of PNZ-PN precursor was characterized by FT-IR and DSC. The thermal stability of the cured PNZPN
was evaluated by TGA. The microstructure and components of the ceramic samples were analyzed by XRD,SEM
and elements analysis. The results showed that the ceramic sample consisted of ZrO2 below 1 200℃ and low crystalline
ZrC appeared initially at 1 400℃ due to carbothermal reduction. At 1 600℃, the ZrO2could be converted into pure
ZrC completely. The ZrO2crystalline phase and carbon content in 1 600℃ ceramic samples could be controlled by the
amount of PN to get near pure phase ZrC with free carbon of 1. 66%. The Zr, and C elements are well distributed in
the ceramic sample consisted of high crystalline degrees of ZrC particles with a size distribution of 100 to 200 nm.

Abstract:Modified phenolic resin was prepared using thermal prepolymerization between barium-phenolic resin
and modifier. The cured modified phenolic resin with regular size and shape was prepared using the technology of
compress moding, and then, it was carbonized at the temperature of 400℃ and 700℃ to prepare the carbonized samples,
which was used to measure density, weight loss, and shrinkage ratio. The influence of modifier on the morphology,
surface area, thermal insulation properties and compression strength was also studied. The results of scanning electron
microscope (SEM) showed that after calcinations at 700℃, the “ coral-like ” carbon structure was observed
with the nanopores in a range of between 30 to150 nm and a relatively high brunauer-emmett-teller (BET) surface area
of 464 m2 / g. Compared to the carbonized sample from unmodified phenolic resin, the test of insulation properties
and mechanical properties showed that the thermal conductivity of modified phenolic resin was reduced by 45． 57%,
but still retained good compression strength.

Abstract:Two kinds of low density ablative thermal protection materials reinforced by honeycomb was developed
according to the requirements of long time ablation and thermal protection. Arc heated wind tunnel experimental were
applied to test their property of thermal protection. Their mechanical property and thermophysical property were researched
also. The carbon layer of the low density materials reinforced by honeycomb on the surface was even and intact
after ablation without erosion markedly while the back temperatures were below 200℃ under the two long time(1 000 s)
heat environment and excellent heat-insulating property and well poperty of resisting the flush of gas flow was displayed.

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