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Zhu Jiaoqun

Bio: Zhu Jiaoqun is an academic researcher from Wuhan University of Technology. The author has contributed to research in topics: Spark plasma sintering & Powder mixture. The author has an hindex of 4, co-authored 8 publications receiving 45 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the effect of aluminum on the synthesis of polycrystalline bulk Ti3SiC2 from elemental powders was investigated using X-ray diffraction patterns and scanning electron microscopy photographs.
Abstract: The effect of aluminum on synthesis of Ti3SiC2 by spark plasma sintering (SPS) from elemental powders was investigated in this paper. X-ray diffraction patterns and scanning electron microscopy photographs of samples with different content of aluminum indicated that proper addition of aluminum both favored the formation and accelerated the crystal growth of Ti3SiC2. The process parameters in the sintering course revealed that addition of aluminum decreased the temperature for the synthesis reaction of Ti3SiC2. Polycrystalline bulk Ti3SiC2 material with high purity and density could be fabricated by spark plasma sintering from the elemental powder mixture with starting composition of Ti3Si1−xAlxC2, where x = 0.05–0.2. SEM photographs showed Ti3SiC2 synthesized from elemental powders was in plane-shape with a size of about 10–20 µm in the elongated dimension. Solid solution of aluminum decreased the thermal stability of Ti3SiC2 and made the temperature at which Ti3SiC2 decomposed be as low as 1300°C.

19 citations

Journal ArticleDOI
TL;DR: In this paper, the microstructure, flexural strength and fracture toughness of dense Ti 3 AlC 2 /TiB 2 composites were successfully fabricated from B 4 C/TiC/Ti/Al powders by spark plasma sintering (SPS).

12 citations

Journal ArticleDOI
TL;DR: In this article, in-situ hot pressing of Ti/Al/C powders mixtures and sintered at different temperatures were investigated by X-ray diffraction (XRD) of samples.
Abstract: TiAl/Ti2 AlC composites were prepared by in-situ hot pressing of Ti/Al/C powders mixtures and sintered at different temperatures were investigated by X-ray diffraction (XRD) of samples. The reaction procedure of Ti-Al-C system could be divided into three stages. Below 900°C, Ti reacts with Al to form TiAl intermetallics; above 900°C, C reacts with remain Ti to form TiC triggered by the exothermal reaction of Ti and Al; TiAl reacts with TiC to produce dense TiAl/Ti2 AlC composites. In the holding stage, ternary Ti2AlC develops to layered polycrystal and composites pyknosis in the meanwhile. The mechanism of synthesis and microstructure was especially discussed.

7 citations

Journal Article
TL;DR: By the means of XRD,SEM, content of chemically combined water and heat of hydration, etc, the composition and structure of phosphogypsum were analyzed in this article.
Abstract: By the means of XRD,SEM,content of chemically combined water and heat of hydration,etc,the composition and structure of phosphogypsum were analyzedInfluence of phosphogypsum on physical properties and hydration process of Portland cement was studiedThen,the action of phosphorus and fluorine in phosphogypsum to the hydration of C3S was further disscussed

5 citations

Journal ArticleDOI
TL;DR: In this paper, the phase change temperatures and the latent heats of the composite phase change material are respectively 139.0 and 48.82 J/g for 30% (by mass) adipic acid loading and 140.5 and 71.89 J /g for 50% (By mass) silicon dioxide loading.
Abstract: Adipic acid-amorphous silica composite phase change thermal energy materials are prepared by using a hydrothermal method. The composite materials are characterized by X-ray diffraction(XRD), Fourier transformation infrared spectroscopy(FT-IR), field emission scanning electron microscope(FE-SEM), and synchronous thermal gravimetric analyzer(TGA) and differential scanning calorimetry(DSC). The results show no sign of chemical reactions between adipic acid and silicon dioxide at pH of 5 and temperature of 150 ℃. The particle size of the composite phase change material is uniform with 1—2 μm diameter. The phase change temperatures and the latent heats of the composites are respectively 139.0 ℃ and 48.82 J/g for 30%(by mass) adipic acid loading and 140.5 ℃and 71.89 J/g for 50%(by mass) adipic acid loading.

2 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the researches on clay mineral-based form-stable phase change materials (FSPCM) were reviewed in this paper, nine kinds of clay mineral materials were summarized, that is kaolin, diatomite, sepiolite, montmorillonite, perlite, SiO2, attapulgite, vermiculite and fly ash.
Abstract: Thermal energy storage plays a crucial role in energy conservation and environmental protection Research on thermal energy storage of phase change materials (PCM) has been standing in the forefront of science Several evident defects exist in the phase change materials such as low thermal conductivity and leakage during the phase change process Meanwhile, the clay mineral materials have relatively high thermal conductivity and excellent adsorbability, which can successfully remedy the defects resided in PCM Thus, the researches on clay mineral-based form-stable phase change materials (FSPCM) were reviewed in this paper Nine kinds of clay mineral materials were summarized, that is kaolin, diatomite, sepiolite, montmorillonite, perlite, SiO2, attapulgite, vermiculite and fly ash The large specific surface area and prominent porous structure of clay mineral materials can successfully prevent the flow and leakage of PCM within the clay mineral-based FSPCM Hence, this paper can partly serve as a reference for thermal energy storage and conservation

252 citations

Journal ArticleDOI
TL;DR: In this article, the effect of using nano cotton stalk ash (NCSA) and palm leaf ash (PLA) as partial replacements to cement in ultra-high performance concrete (UHPC) was investigated.

133 citations

Journal ArticleDOI
TL;DR: In this article, the stability of the reinforcing particles in Cu-Ti 3 SiC 2 composites at different sintering temperatures was studied and it was shown that the composites prepared by warm compaction powder metallurgy forming and spark plasma Sintering at 750-°C have lower density when compared with the composite prepared by SPS sintered at 950°C, but their electrical resistivity values are very close to each other and even lower.

66 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of P2O5 and F impurities in PG on clinker formation and cement hydration was investigated, and the results showed that the P 2O5 impurity in PG could promote the formation of clinker at 1100°C, which is ∼50°C lower than the clinker prepared with natural gypsum.

62 citations

Book ChapterDOI
01 Jan 2012
TL;DR: In this paper, a critical review of SPS-based synthesis/consolidation of thermodynamically stable MAX phases is provided, highlighting the effects of starting composition and SPS processing parameters on densification behavior of various MAX phases.
Abstract: MAX phases are layered ternary carbides and nitrides exhibiting combination of properties of metallic and ceramic materials. Recently, spark plasma sintering (SPS) is attracting significant attention for the processing of this relatively new class of materials. The SPS process allows in situ synthesis of MAX phases from starting elemental powder. Also, the unique mechanisms associated with the SPS process result in near complete densification at relatively lower temperature and shorter sintering time compared to conventional hot pressing. This chapter provides a critical review of SPS based synthesis/consolidation of thermodynamically stable MAX phases. Starting with a brief introduction of SPS processing, this chapter highlights the effects of starting composition and SPS processing parameters on densification behavior of various MAX phases and related materials, including 413 phases (Nb 4 AlC 3 ), 312 phases (Ti 3 SiC 2 and Ti 3 AlC 2 ), 211 phases (Ti 2 AlN, Ti 2 AlC, Cr 2 AlC, Cr 2 GaC, and Ti 2 GaC), MAX phase composites, MAX phase solid solutions, and MAX phase coatings.

48 citations