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Otherwise, the mixed powders may be ignited as in the self-propagating high-temperature synthesis (SHS) process.
If SHS process occurs, the compact may reach a very high temperature resulting the melting of the component phases.
The phase compositions of the obtained products were determined by X-ray diffraction (XRD) using CuKα radiation after removing the surface layers by grinding.

The main experimental material is TiB2 powder (d50=3.65µm), which was synthesized by the self-propagating high-temperature synthesis (SHS).
The TiB2 slurry for impregnating the polyurethane sponges was prepared by mixing the ceramic powder and above-mentioned additives with deionized water, the solution then milled for 24h in a plastic bottle with aluminum ball as grinding media.

The importance of industrialization of the SHS process is also realized.
Conventional SHS: condensed phase combustion It is not an easy task to produce nanomaterials by conventional SHS, where the typical scale of heterogeneity for the initial solid reactants is on the order of 10–100 nm.
However, several methods were suggested for synthesis of nanomaterials by using this approach: (i) SHS synthesis, followed by intensive milling; (ii) SHS + mechanical activation (MA); (iii) SHS synthesis followed by chemical treatment, so-called chemical dispersion; (iv) SHS with additives; (v) carbon combustion synthesis (CCS).
The process of etching SHS-powders in an appropriate dilute acid (e.g.
Morphological of as-prepared and annealed samples was examined by SEM (JEOL-6360) and high-resolution transmission electron microscopy (HRTEM) were prepared by grinding the powder under ethanol; drops of the suspension were deposited on grids.

However, in the system of Al/C, Al particles are covered with ultrafine carbon after mechanically grinding.
As for the samples with higher Al/C ratio (J2), with lower diluents (C) and higher Al content, the nitridation reaction at 1400 °C is very quick and the exothermic action is quite strong, which is similar to SHS process.

Fig.2 The liquidus of Al-11%Zn-3%Mg-1%Cu-0.13%Zr alloy To investigate the microstructure features of the samples, they were cut distance from the top of 38mm and prepared by the standard technique of grinding with SiC abrasive papers from 400# to 2000# and subsequently mechanical polishing.
Rare Matel Materials and Engineering. 2010;39:1135-1140 [8] Pourkia N, Emamy M, Farhangi H, Ebrahimi SHS.

By machining the parts directly after they are hardened, hard turning offers a number of potential benefits over traditional form grinding, such as the lower costs of the equipment, shorter setup time, fewer process steps, and elimination of the cutting fluid.
The PPS method has been used for sintering a wide variety of materials, such as diamond-WCCo [11] and diamond-Cu [12] composites, nanocrystalline sinters [13-15], and, in combination with the SHS reaction, for fabricating high-melting ceramics [16-18].

At present, several techniques have been developed to prepare NiFe2O4 nanoparticles, including sol–gel method[4-6] ,Hydrothermal method[7,8],shock wave method[9],mechanical alloying[10],SHS[11,12]and etc[13,14].
And there is no agglomeration.This may be because:(1)The activated carbon can adsorb the anions and cations from solution, so the crystal growth is limited in a certain environments.What is more,during the auto combustion process,between the crystal and crystal was separated by activated carbon.(2)There are advantages of dryness in water bath,which can heated uniformly and reduced the hard agglomeration. (3)During the final grinding,milled in the ethanol can reduced the agglomeration because of friction generate heat ,which can change the chemical structure of the precursors.

In order to use walnut shells as fine aggregate in the building materials production based on Portland cement, it is necessary to solve the following tasks: 1. grinding the shell to the required size; 2. processing of the shell to extract “cement poisons” [9,10]; 3. such aggregate technical characteristics determination, necessary for the building conglomerate or solution optimal composition selection; 4. lightweight concrete composition design, ensuring its optimal performance.
Methods and Materials The walnut shell grinding was carried out in an MSL-1P drum mill (laboratory ball mill).
The samples steaming was carried out using the drying cabinet SHS-80-01 SPU.
Moisture absorbed by the aggregate is likely to be able to eliminate the operation of wetting the concrete stone in the first 3 days; The grain composition after grinding is presented in Table 1.

Introduction Self-propagating high-temperature synthesis (SHS), also known as combustion synthesis, was pioneered by Merzhanov and co-workers and is being intensely researched by the USA and Japan.
The directions of both the diamond grinding and the beveling were parallel to that of the bar length.

As 20 40 60 80 Intensity (arbitrary unit) 2θ/ ° (Cu-Kα) (B) (A) Al Al2O3 α-Al2O3 (Al2O3)5·H2O 20 40 60 80 Intensity (arbitrary unit) 2θ/ ° (Cu-Kα) 20 40 60 80 Intensity (arbitrary unit) 2θ/ ° (Cu-Kα) (B) (A) Al Al2O3 α-Al2O3 (Al2O3)5·H2O Fig. 1 XRD patterns of the drosses used in this study ((A) H-D, (B) L-D) Fig. 2 XRD patterns of the product using the mixture of H-D and Al powders at initial N2 pressure of 1 MPa (mixing ratio of (A) 0.2, (B) 0.3, (C) 0.4) Intensity (arbitrary unit) 2θ/ ° (Cu-Kα) 10 30 50 70 90 AlON AlN Al Al2O3 (A) (B) (C) 10 30 50 70 90 AlON AlN Al Al2O3 (A) (B) (C) Intensity (arbitrary unit) 2θ/ ° (Cu-Kα) 10 30 50 70 90 AlON AlN Al Al2O3 (A) (B) (C) 10 30 50 70 90 AlON AlN Al Al2O3 (A) (B) (C) shown in Fig.2, nitride-related compounds such as AlN, AlON were synthesized by SHS process.
part, the particle size of L-D was adjusted to similar mean size of Al powder (d50 = 34 20 40 60 80 Intensity (arbitrary unit) 2θ/ ° (Cu-Kα) AlON AlN Al Al2O3 (B) (A) 20 40 60 80 Intensity (arbitrary unit) 2θ/ ° (Cu-Kα) AlON AlN Al Al2O3 20 40 60 80 Intensity (arbitrary unit) 2θ/ ° (Cu-Kα) AlON AlN Al Al2O3 (B) (A) Fig. 3 XRD patterns of the combustion product using the mixture of L-D (d50 = 52.5 µm) and Al powders at initial pressure of 3 MPa, the mixing ratio of 0.3 ((A) inner part, (B) outer part of reacted compact) Fig. 4 XRD patterns of the combustion product using the mixture of L-D (d50 = 36.8 µm) and Al powders at initial pressure of 3 MPa, the mixing ratio of 0.3 ((A) inner part, (B) outer part of reacted compact) Intensity (arbitrary unit) 2θ/ ° (Cu-Kα) 20 40 60 80 AlON AlN Al Al2O3 (B) (A) Intensity (arbitrary unit) 2θ/ ° (Cu-Kα) 20 40 60 80 AlON AlN Al Al2O3 (B) (A) µm), by means of rod-grinding